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/services/constantsService.js

@@ -4,6 +4,7 @@ function ConstantsService(i18nService) {
         disableGaKey: 'disableGa',
         disableAddLoginNotificationKey: 'disableAddLoginNotification',
         disableContextMenuItemKey: 'disableContextMenuItem',
+        disableFaviconKey: 'disableFavicon',
         disableAutoTotpCopyKey: 'disableAutoTotpCopy',
         enableAutoFillOnPageLoadKey: 'enableAutoFillOnPageLoad',
         lockOptionKey: 'lockOption',