Switch to alternative adapter to fix mentions

The current hipchat adapter appears to have trouble picking up the mentions and saving new users correctly. Someone already did the work, so here it is :smile: 

Here's the differences (https://github.com/negativetwelve/hubot-hipchat/compare/hipchat:master...master):
```diff
diff --git a/src/connector.coffee b/src/connector.coffee
index d8c51c5..6fb5254 100644
--- a/src/connector.coffee
+++ b/src/connector.coffee
@@ -476,6 +476,7 @@ onStanza = (stanza) ->
     return if not from
     if type is "unavailable"
       @emit "leave", from, room, name
+      # @emit "leave", from, name, room
     else if type is "available" and entity.attrs.role is "participant"
       @emit "enter", from, room, name
 
diff --git a/src/hipchat.coffee b/src/hipchat.coffee
index e4b1890..18b8c4b 100644
--- a/src/hipchat.coffee
+++ b/src/hipchat.coffee
@@ -88,12 +88,19 @@ class HipChat extends Adapter
 
       saveUsers = (users) =>
         # Save users to brain
+        console.log("save users")
+        @logger.info users
         for user in users
           user.id = @userIdFromJid user.jid
           # userForId will not overwrite an existing user
-          if user.id of @robot.brain.data.users
+          if user.id in @robot.brain.data.users
             delete @robot.brain.data.users[user.id]
           @robot.brain.userForId user.id, user
+          @robot.brain.data.users[user.id]['mention_name'] = user.mention_name
+        @robot.brain.emit('save', @robot.brain.data)
+        @logger.info "After setting the users..."
+        @logger.info @robot.brain.data.users
+
 
       # Fetch user info
       connector.getRoster (err, users, stanza) =>
@@ -121,6 +128,7 @@ class HipChat extends Adapter
           @logger.error "Can't list users: #{errmsg err}" if err
 
       connector.onRosterChange (users) =>
+        console.log("Roster has changed")
         saveUsers(users)
 
       handleMessage = (opts) =>
@@ -156,19 +164,18 @@ class HipChat extends Adapter
           message: message
           reply_to: from
 
-      changePresence = (PresenceMessage, user_jid, room_jid, currentName) =>
+      changePresence = (PresenceMessage, user_jid, room_jid, current_name) =>
         # buffer presence events until the roster fetch completes
         # to ensure user data is properly loaded
         init.done =>
           user = @robot.brain.userForId(@userIdFromJid(user_jid)) or {}
           if user
             user.room = room_jid
-            # If an updated name was sent as part of a presence, update it now
-            user.name = currentName if currentName.length
+            user.name = current_name if current_name.length
             @receive new PresenceMessage(user)
 
-      connector.onEnter (user_jid, room_jid, currentName) =>
-        changePresence EnterMessage, user_jid, room_jid, currentName
+      connector.onEnter (user_jid, room_jid, current_name) =>
+        changePresence EnterMessage, user_jid, room_jid, current_name
 
       connector.onLeave (user_jid, room_jid) ->
         changePresence LeaveMessage, user_jid, room_jid```