Added android v7 compatibility library with resource.  Added twitter theme.

Added a reference to android compatibility library project,
android-support-v7-appcompat,  built using these instructions:
http://developer.android.com/tools/support-library/setup.html, except
that in step 4, before selecting 'Finish', check the box 'Copy files to
workspace'.  This avoids a bug with some eclipse version when linking to
android library projects.
Added a twitter-like theme (lots of resources) created at
http://jgilfelt.github.io/android-actionbarstylegenerator/#name=twitter&compat=appcompat&theme=light&actionbarstyle=solid&texture=0&hairline=0&neutralPressed=0&backColor=55acee%2C100&secondaryColor=D6D6D6%2C100&tabColor=55acee%2C100&tertiaryColor=f5f8fa%2C100&accentColor=55acee%2C100&cabBackColor=FFFFFF%2C100&cabHighlightColor=55acee%2C100