Embed release version in built package

Rather than relying on the release version being passed in as config,
build the current release version (as read from `package.json`) into the
bundle.

We use browserify-versionify for this, rather than simply requiring
`package.json`, as our current build toolchain does not support any kind
of tree-shaking, so `require('package.json')` would pull the whole of
the `package.json` file into the bundle.

h/static/scripts/directive/help-panel.js

@@ -13,7 +13,7 @@ module.exports = function () {
     // @ngInject
     controller: function ($scope, $window, settings, crossframe) {
       this.userAgent = $window.navigator.userAgent;
-      this.version = settings.release;
+      this.version = '__VERSION__';  // replaced by versionify
       this.dateTime = new Date();
       this.serviceUrl = settings.serviceUrl;
 

h/static/scripts/raven.js

@@ -74,7 +74,7 @@ function translateSourceURLs(data) {
 
 function init(config) {
   Raven.config(config.dsn, {
-    release: config.release,
+    release: '__VERSION__',  // replaced by versionify
     dataCallback: translateSourceURLs,
   }).install();
   installUnhandledPromiseErrorHandler();

package.json

@@ -21,6 +21,7 @@
     "browserify": "^13.0.0",
     "browserify-ngannotate": "^1.0.1",
     "browserify-shim": "^3.8.12",
+    "browserify-versionify": "^1.0.6",
     "chai": "^3.5.0",
     "check-dependencies": "^0.12.0",
     "classnames": "^2.2.4",
@@ -95,6 +96,7 @@
     "transform": [
       "browserify-ngannotate",
       "browserify-shim",
+      "browserify-versionify",
       [
         "stringify",
         {