Created ArticleListPageAdapter extending FragmentPagerAdapter to handle
RSS and DB page Fragments.
Added ArticlesListsActivity, to contain newly made RSSListFragment and
DBListFragment, both Fragments to replace old ArticlesListActivity and
SavedArticlesListActivity.
This is to allow switching between RSS feed list and saved articles list
by swiping.
Finished RSSList Fragment and DBList Fragment.
Added GestureImageView from Jason Polites (Apache 2.0), finished
implementing RSS and DB lists as fragments of a ViewPager, added menu to
header image.
Fixed bugs in ViewPager's Fragments and in Articles Category Logos.
Added OnLongClickListener to allow for quick article deletion in
DBFragment.
Removed unused imports.