Add TypeScript declarations to iron-label. (#22)

* Generate minimal package.json from bower.json
* Update and/or configure type declarations.

.gitignore

@@ -1,2 +1,3 @@
 bower_components*
 bower-*.json
+node_modules

.travis.yml

@@ -3,6 +3,10 @@ sudo: required
 before_script:
   - npm install -g polymer-cli
   - polymer install --variants
+  - >-
+    npm run update-types && git diff --exit-code || (echo -e
+    '\n\033[31mERROR:\033[0m Typings are stale. Please run "npm run
+    update-types".' && false)
 env:
   global:
     - secure: >-

iron-label.d.ts

@@ -0,0 +1,39 @@
+/**
+ * DO NOT EDIT
+ *
+ * This file was automatically generated by
+ *   https://github.com/Polymer/gen-typescript-declarations
+ *
+ * To modify these typings, edit the source file(s):
+ *   iron-label.html
+ */
+
+/// <reference path="../polymer/types/polymer.d.ts" />
+
+declare namespace Polymer {
+
+  class IronLabel extends Polymer.Element {
+
+    /**
+     * An ID reference to another element that needs to be
+     * labelled by this `iron-label` element.
+     */
+    for: string|null|undefined;
+    _forElement: Element|null;
+    attached(): void;
+    ready(): void;
+
+    /**
+     * generate a unique id for this element
+     */
+    _generateLabelId(): void;
+    _findTarget(): any;
+    _tapHandler(ev: any): void;
+    _applyLabelledBy(): void;
+    _forChanged(): void;
+  }
+}
+
+interface HTMLElementTagNameMap {
+  "iron-label": Polymer.IronLabel;
+}