Costumized action bar for transparent  and blur effect

Modified for list view, when list header is in screen, action bar is
transparent. When user scrolls list header out of screen, action bar
will become blur.
Comment out for classes requiring higher SDK

Comment out Lint and use of ScriptIntrinsicBlur to create blur image.
Add textview for title shown in action bar

Add title for action bar, so that it will be shown in the center of
entire action bar.
Remove all extra space on blank lines
More extra space on blank lines.
Merge pull request #1 from cyuan1124/master

Costumized action bar for transparent  and blur effect