Update Jcrop to version 0.9.12 (closes #34)

Still needs an upgrade step.
Merge remote-tracking branch 'origin/master' into Jcrop-0.9.12

Conflicts:
	CHANGES.txt
Merge pull request #42 from collective/Jcrop-0.9.12

Update Jcrop to version 0.9.12 (closes #34)
Major cleanup and split up code and interfaces into Dexterity and Archtypes.
  Also renamed/ moved Interfaces to be used as markers! Attention, in custom
  code minor changes are needed in order to point to the correct interfaces.
  see README for details.
sort imports
flake 8 fix
fix ReST
overhaul of README.rst
complete renaming
travis has problem with this
for some reason here a different version is needed for plone 5 travis tests at least
minor documentation changes
lets see if this fixes problems with Plone 4.3 tests
Add a test for copy-image, add basic subscriber
Merge branch 'copy-image-subscriber' of github.com:collective/plone.app.imagecropping into copy-image-subscriber