implement LoaderManager to update ListView in TimelineActivity

Specify min sdk version 11, instead of 4, to use LoaderManager class.
Target build to run on 4.0.3 Ice Cream Sandwich (API 15).
Change status EditText background to non-white for Holo's white font.
Ref for implementation is
 http://developer.android.com/reference/android/app/LoaderManager.html
Refactor implementation of LoaderManager and CursorLoader.
Refactor Options Menu to work in Nexus 4 (4.2.2) and add action bar items.
Minor refactoring of xml in layouts.