Remove unnecessary polyfills from production

Function.prototype.bind is supported in every browser for a long time.
It's only needed because, oddly, PhantomJS 1.8 doesn't support it.

The window.URL constructor is supported in IE10+ and every other major
browser for a while now. It's also not supported in PhantomJS 1.8,
though. The application currently doesn't work on IE < 10 anyway so
let's just remove this for now.

h/static/scripts/karma.config.js

@@ -26,18 +26,20 @@ module.exports = function(config) {
       '../../../node_modules/angular-route/angular-route.js',
       '../../../node_modules/angular-sanitize/angular-sanitize.js',
       '../../../node_modules/ng-tags-input/build/ng-tags-input.min.js',
-      '../../../node_modules/es6-promise/dist/es6-promise.js',
       'vendor/angular-bootstrap.js',
       'vendor/annotator.js',
       'vendor/katex.js',
-      'vendor/polyfills/bind.js',
-      'vendor/polyfills/url.js',
 
       // Test deps
       '../../../node_modules/angular-mocks/angular-mocks.js',
       '../../templates/client/*.html',
       'test/bootstrap.js',
 
+      // These are needed until PhantomJS 2.0
+      '../../../node_modules/es6-promise/dist/es6-promise.js',
+      'test/polyfills/bind.js',
+      'test/polyfills/url.js',
+
       // Tests
       '**/*-test.coffee',
       '**/*-test.js'