added a way to show unread comics only. https://github.com/applications4android/ComicReader/issues/96
Added comments to code
Needed to do a small hack by changing mFavIdx to an int[] which passes by
reference, so I could simplify the code and combine repetitive code. and
added the method _specialViewNavigation
fixed a messed up comment
Merge pull request #99 from whitecat/unread

added a way to show unread comics only.