The ddp client was silently ignoring error callbacks. Throwing up an error in case at least a closed websocket issue arises

Remove user not found handling.

Show avatar with username initials.

Merge branch 'avatar-with-username-initials' of github.com:filipedelimabrito/Rocket.Chat.Android into avatar-with-username-initials

Update Google Play library version.

Removed repeated subscriptions to the same room when registering observers and unnecessary refresh calls to the RoomFragment to update its UI

Since it is a helper, we don't need to instantiate the RocketChatUserAvatar to each use. This commit adds methods to get a drawable with username initials.