fix grunt; fix npm run start; write to plottable.js while dev-wat…

…ching (#3225)

* fix `grunt`; fix `npm run start`; watch writes to plottable.js

webpack-dev-server now emits the plottable.js file as it gets changed.
Unfortunately, because of gajus/write-file-webpack-plugin#35
I turned off livereloading unless you use the localhost:9999/webpack-dev-server/<filepath>
url.

* include write-file-webpack-plugin as a devDependency

Gruntfile.js

@@ -194,7 +194,7 @@ module.exports = function(grunt) {
   grunt.registerTask("dist-compile", ["test", "uglify", "compress"]);
 
   grunt.registerTask("commitjs", ["dist-compile", "gitcommit:built"]);
-  grunt.registerTask("default", ["npm run start"]);
+  grunt.registerTask("default", ["exec:npm:start"]);
 
   grunt.registerTask("test", ["dev-compile", "test-local"]);
   grunt.registerTask("test-local", ["blanket_mocha", "lint"]);

package.json

@@ -15,9 +15,10 @@
     "build:tsc": "tsc -p test/",
     "build:webpack": "webpack --config webpack.config.js",
     "check_version": "echo ${npm_package_version} $(npm view ${npm_package_name} version) | awk '{ if ($1 == $2) { exit 1 }}'",
-    "start": "npm-run-all -p watch:watch-tsc watch:watch-quicktests webpack-dev-server",
+    "start": "npm-run-all -p start:watch-tsc start:watch-quicktests start:webpack-dev-server",
     "start:watch-quicktests": "grunt watch-quicktests",
     "start:watch-tsc": "tsc -w -p test/",
+    "start:webpack-dev-server": "webpack-dev-server",
     "test": "grunt test-travis"
   },
   "devDependencies": {
@@ -56,7 +57,8 @@
     "tslint": "3.15.1",
     "typescript": "2.0.6",
     "webpack": "2.2.1",
-    "webpack-dev-server": "2.3.0"
+    "webpack-dev-server": "2.3.0",
+    "write-file-webpack-plugin": "3.4.2"
   },
   "dependencies": {
     "d3": "^3.5.16",