Removes mockAdapters and previous version of backendAdapters
Removes stupid comparing of string object
Removes unnecessary enum EntityConst
Merge branch 'fix/backend'

* fix/backend:
  Removes unnecessary enum EntityConst
  Removes stupid comparing of string object
  Removes mockAdapters and previous version of backendAdapters

Conflicts:
	src/ch/uzh/ifi/se/yapp/backend/landscape/MockLandscapeAdapter.java