Blocked initialization with ui thread on application startup

[ypresto]

Initialization of large number of injection causes freeze on application startup.

On application startup, android initializes following order:

1. ContentProvider
2. Application
3. Activity

Some of triaina-oriented android classes tries to do blocking initialization

• TriainaContentProvider
• TriainaApplication

These calls setBaseApplicationInjector() (directly, or via getInjector()) from GUI thread in onCreate().

Original roboguice has its own splash screen with application initialize capability.

https://code.google.com/p/roboguice/source/browse/roboguice/src/main/java/roboguice/activity/RoboSplashActivity.java?spec=svn0eaedd3ee5457fba323ec14e9a6c5f73c2c1facf&r=dc3f949dc64a695bcee965f19c8414df7f9f7674

(It shows splash every startups, improve might be required.)