Implement some cleanup functions

As now all records are accessed by relations (anime-/mangalist or record
relations like prequels, adaptations etc.) all records in the database
that are not related somehow are "dead" records. So I implemented some
functions to delete them:
- deleteFrom(Anime/Manga)List() now checks if the deleted record is
  still related to other records and deletes it if not
- a full sync now also checks for unrelated records and deletes them
getRecords() should do something useful when offline

... so now it tries to get the record from the Database and shows a
crouton message if this didn't work.
Add setViews method and order all the views (Detailview)
Create ViewPagerAdapter & Detailview fragment & add tab strings (Detailview & Strings)
Remove old layout-land to fix crash (DetailView)
Replace DV with tabbed fragments (Detailview)