Message Center: First check-in
Just a statically rendered set of messages for now.
[#ANDROID-91] Update message bubble icons
[#ANDROID-92] Add input fields for message center
Latest changes to Message Center.
Remove testing API key from repo.
Refactor ApptentiveClient to remove duplicate code. Everything will use one generic GET/POST method for now.
Message Center and communication changes,

This is a big one, and even touches our threaded payload uploading code.

Everything will use one generic GET/POST method for now.
[#ANDROID-99]
[#ANDROID-100]
Update copyright in message center layout.
Add test project, with a few test cases.
Check in test project properties.
Fix a potential bug where Apptentive may not be initialized before our view run, due to GC.
Tons of Message Center work, including a first stab at the new UI from Josh, FileMessage, and numerous other small things.
Mostly finish new UI from Josh. Sliding Drawer animates smoothly. Background scrolls with message scrolling.
Message Center: Support landscape. Refactor text messages into XML to ease customization. Refactor colors into values/colors.xml so they are in one place. Fix unchecked call warning.
Message Center: A bunch of work on Message Center styles and alternate Message UIs.
Message Center: Tons of work. This should probably have been in a smaller changelist. New Object model mostly done. New send worker. New database schema and helpers, message sent callback, partial new message center UI. Lots of further work to be done.
[#ANDROID-118] [#ANDROID-119] [#ANDROID-120] [#ANDROID-121] [#ANDROID-122]
Add the actual UI stuff for the new Message Center views. Some of these will be deleted later, but are checked in for safety right now.
Refactor TextMessageView to push most of the common Message stuff into MessageView. Delete other TextMessageView implementations. and layouts.
Fix avatar fetching to not block the UI thread.
Fix Apptentive initialization to fix a problem where the SDK thought it had initialized, but there was no token fetched.