ActionBarSherlock added

To get ActionBarSherlock into your workspace and get it working:
- Import the "library" like it is another project
- Right-click the reader project -> Properties -> Android -> Add... -> library -> Apply
- If more errors show, reimport the Support Library into the "library" project

TODO:
- To test on lower end devices, which I don't have
- Possibility need to update the theme/UIHelper.java

Main Changes:
- Changed all activities to the relevent Sherlock counterparts
- Menu and MenuItem referenced from ActionBarSherlock lib
- DisplayNovelPagerActivity changed from TabActivity to SherlockActivity. Minor code changes to accommodate the lost of the "TabActivity" functionality