chore: make POM ready for deployment to Maven Central

This commit basically follows the guidelines outlined [here][1]:

* Update the SCM section.
* Add a new developer ([email protected], PGP key ID BE65F50D) as
  developer to this project.
* Create a `release` profile that will attach the source code, generate
  javadoc and sign the artifacts with the private key of the releaser.
  This is in a separate profile because these tasks take time and are
  only necessary when releasing to Maven Central.

When releasing in the future, these are the steps to follow:

* Develop
* Commit any outstanding changes
* Run tests, make sure build passes
* Update versions to release version
* Commit release version
* Run deployment
* Update versions to next snapshot version
* Commit new snapshot version
* Develop, develop, develop and rinse and repeat

[1]: <https://central.sonatype.org/publish/publish-guide/>

pom.xml

@@ -19,8 +19,9 @@
     </licenses>
 
     <scm>
-        <url>https://github.com/bolcom/cryptvault</url>
-        <connection>https://github.com/bolcom/cryptvault</connection>
+        <url>https://github.com/bolcom/cryptvault/tree/master</url>
+        <connection>scm:git:https://github.com/bolcom/cryptvault.git</connection>
+        <developerConnection>scm:git:ssh://github.com/bolcom/cryptvault.git</developerConnection>
     </scm>
 
     <developers>
@@ -30,7 +31,14 @@
             <email>[email protected]</email>
             <organization>bol.com</organization>
             <timezone>1</timezone>
-            <organizationUrl>http://bol.com</organizationUrl>
+            <organizationUrl>https://bol.com</organizationUrl>
+        </developer>
+        <developer>
+            <name>Stefan van den Akker</name>
+            <email>[email protected]</email>
+            <organization>bol.com</organization>
+            <timezone>1</timezone>
+            <organizationUrl>https://bol.com</organizationUrl>
         </developer>
     </developers>
 
@@ -77,35 +85,91 @@
                     <target>1.8</target>
                 </configuration>
             </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-source-plugin</artifactId>
-                <version>2.4</version>
-                <executions>
-                    <execution>
-                        <id>attach-sources</id>
-                        <goals>
-                            <goal>jar</goal>
-                        </goals>
-                    </execution>
-                </executions>
-            </plugin>
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-javadoc-plugin</artifactId>
-                <version>2.10.3</version>
-                <executions>
-                    <execution>
-                        <id>attach-javadocs</id>
-                        <goals>
-                            <goal>jar</goal>
-                        </goals>
-                        <configuration>
-                            <additionalparam>-Xdoclint:none</additionalparam>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
         </plugins>
     </build>
+
+    <profiles>
+        <!-- release with: export GPG_TTY=$(tty); mvn versions:set -DnewVersion=1.2.3 && mvn clean deploy -P release -->
+        <profile>
+            <id>release</id>
+            <build>
+                <plugins>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-source-plugin</artifactId>
+                        <version>2.4</version>
+                        <executions>
+                            <execution>
+                                <id>attach-sources</id>
+                                <goals>
+                                    <goal>jar-no-fork</goal>
+                                </goals>
+                            </execution>
+                        </executions>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-javadoc-plugin</artifactId>
+                        <version>2.10.3</version>
+                        <executions>
+                            <execution>
+                                <id>attach-javadocs</id>
+                                <goals>
+                                    <goal>jar</goal>
+                                </goals>
+                                <configuration>
+                                    <additionalparam>-Xdoclint:none</additionalparam>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.apache.maven.plugins</groupId>
+                        <artifactId>maven-gpg-plugin</artifactId>
+                        <version>1.5</version>
+                        <executions>
+                            <execution>
+                                <id>sign-artifacts</id>
+                                <phase>verify</phase>
+                                <goals>
+                                    <goal>sign</goal>
+                                </goals>
+                                <configuration>
+                                    <!-- create profile in your ~/.m2/settings.xml that contains gpg.keyname + short key ID as property -->
+                                    <!-- e.g. <settings><profiles><profile><activation><activeByDefault>true</activeByDefault></activation><properties><gpg.keyname>BE65F50D</gpg.keyname> etc. -->
+                                    <keyname>${gpg.keyname}</keyname>
+                                    <gpgArguments>
+                                        <arg>--pinentry-mode</arg>
+                                        <arg>loopback</arg>
+                                    </gpgArguments>
+                                </configuration>
+                            </execution>
+                        </executions>
+                    </plugin>
+                    <plugin>
+                        <groupId>org.sonatype.plugins</groupId>
+                        <artifactId>nexus-staging-maven-plugin</artifactId>
+                        <version>1.6.13</version>
+                        <extensions>true</extensions>
+                        <configuration>
+                            <serverId>ossrh</serverId>
+                            <nexusUrl>https://oss.sonatype.org/</nexusUrl>
+                            <autoReleaseAfterClose>false</autoReleaseAfterClose>
+                        </configuration>
+                    </plugin>
+                </plugins>
+            </build>
+        </profile>
+    </profiles>
+
+    <distributionManagement>
+        <snapshotRepository>
+            <id>ossrh</id>
+            <url>https://oss.sonatype.org/content/repositories/snapshots</url>
+        </snapshotRepository>
+        <repository>
+            <id>ossrh</id>
+            <url>https://oss.sonatype.org/service/local/staging/deploy/maven2/</url>
+        </repository>
+    </distributionManagement>
 </project>