Add support for org.matrix.custom.text.html

This format will remain undocumented as it is not yet suitable for
introduction into the specification.

webclient/components/matrix/event-handler-service.js

@@ -460,6 +460,7 @@ function(matrixService, $rootScope, $q, $timeout, mPresence) {
                         handleRoomAliases(event, isLiveEvent);
                         break;
                     case "m.room.message":
+                    case "org.matrix.custom.text.html":
                         handleMessage(event, isLiveEvent);
                         break;
                     case "m.room.member":

webclient/room/room.html

@@ -121,7 +121,8 @@
                         <span ng-show='msg.content.msgtype === "m.text"' 
                               class="message"
                               ng-class="containsBingWord(msg.content.body) && msg.user_id != state.user_id ? msg.echo_msg_state + ' messageBing' : msg.echo_msg_state"
-                              ng-bind-html="((msg.content.msgtype === 'm.text') ? msg.content.body : '') | linky:'_blank'"/>
+                              ng-bind-html="(msg.content.msgtype === 'm.text' && msg.type === 'm.room.message') ? (msg.content.body | linky:'_blank') : 
+                                             (msg.content.msgtype === 'm.text' && msg.type === 'org.matrix.custom.text.html') ? msg.content.body : '' "/>
 
                         <span ng-show='msg.type === "m.call.invite" && msg.user_id == state.user_id'>Outgoing Call{{ isWebRTCSupported ? '' : ' (But your browser does not support VoIP)' }}</span>
                         <span ng-show='msg.type === "m.call.invite" && msg.user_id != state.user_id'>Incoming Call{{ isWebRTCSupported ? '' : ' (But your browser does not support VoIP)' }}</span>