Website icons (#285)

* Initial attempt at adding favicons.

* Cache the favicons for 30 days.

* Refactor faviconService, remove unused faviconDirective.

* Change icon url to icons.bitwarden.com. Update style to support dynamic size of icon.

* Use hostname instead of domain.

* Fix getFavicon throwing an exception if the uri is not a valid url.

* Add enabled property to faviconService to prevent slow calls to storage. Fixed chrome not displaying chrome://favicon properly.

* Fix chrome disable favicon not working as expected.

* Add default icon.

* Fix jshint errors.

* Cleanup of faviconService, removed caching related code. Add faviconComponent for handling favicons.

* Remove faviconService, moved functionallity into faviconComponent.

* Fix faviconComponent not updating when uri changes.

* Rename favicon to icon.

* Improve whitelist.

src/popup/app/components/iconComponent.js

@@ -0,0 +1,26 @@
+angular
+    .module('bit.components')
+    .component('icon', {
+    	bindings: {
+    		uri: '<'
+    	},
+        template: '<div class="icon" ng-if="$ctrl.enabled()"><img src="{{$ctrl.url}}"></div>',
+        controller: function(stateService) {
+            this.$onInit = (function() {
+        		this.enabled = function() {
+                    return stateService.getState('faviconEnabled');
+                };
+            }).bind(this);
+
+            this.$onChanges = (function () {
+                var hostname;
+                try {
+                    hostname = new URL(this.uri).hostname;
+                    this.url = 'https://icons.bitwarden.com/' + hostname + '/icon.png';
+                } catch (e) {
+                    // Invalid URL.
+                    this.url = chrome.extension.getURL('images/fa-globe.png');
+                }
+            }).bind(this);
+        }
+    });