Categories in single page WIP
Merge pull request #207 from i906/dev

Fixed calculator state after rotation
Improved CSV export
Merge remote-tracking branch 'origin/dev' into dev
Refactored categories to be in one screen
Refactored CategoryActivity
Removed unused classes
Refactored category edit. For now only can create expense categories
Portrait and landscape for categories. Very basic for now
Updated changelog so that there is no confusion about not released version
Basic layouts cor category edit
Updated change log
Refactored AccountsActivity
Refactored account activity
Fixed activity labels
Refactored accounts
Refactored transactions list
Refactored transaction details
Refactored transaction edit and did some cleanup
Bumped version to 0.12.0