Revert "First pass abstracting the GR API"

This reverts commit f621492641d7cd6c37abc60ae75d75dd72a040e4.
Update README.md
Fix Thumbnails in rich list
Version 1.0
Merge branch 'refs/heads/master' into NameRefactoring

Conflicts:
	app/src/com/grazerss/BackendProvider.java
	app/src/com/grazerss/DB.java
	app/src/com/grazerss/EntriesRetriever.java
	app/src/com/grazerss/EntryManager.java
	app/src/com/grazerss/SynchronizationService.java
	app/src/com/grazerss/activities/SubscribeFeedActivity.java