Merge pull request #18 from tonysimpson/master

Fixed an edge case with the overlap convolution.
Add WHITE func
Better repr on SliceFniderFilter
Logging on backend
Merge pull request #19 from ant1441/bits

Colour Func & Backend Logging
Overriden __invert__ to be able to use ~ on operators
Added tests for operators in layout_finders
Code cleanup
Update Location's eq func
Add tests for some operators
Merge pull request #20 from jb098/dev

Overridden __invert__ to be able to use ~ on operators. nb care must be taken with finders that are passed to this,in the case where they find multiple things.
Up version.
Allow Fake Backend to take an image as the screen
Merge pull request #21 from ant1441/fake-backend-image

Allow Fake Backend to take an image as the screen
Fix bug in SliceFinderFilter repr
Pushed 1.0a9 to PyPI.
Allow backends to take arbitary arguments.
Merge pull request #22 from ant1441/backend-args

Allow backends to take arbitary arguments.
Fixed bug with exact finder
Merge pull request #23 from jb098/dev

Fixed bug with exact finder