Update docstrings in imio
Improve docs in imio

Also, remove `**kwargs` from `raveler_to_labeled_volume` definition
and replace with named arguments.
More documentation.
HDF5 standard install requires CMake 2.8.6

Add CMake 2.8.6 as requirement to gala to make it clear from start what HDF standard install will require.
Merge pull request #6 from jni/more-docstrings

This PR completes all docstrings for the imio module.
fixes y coordinate issue -- origin change from top right to bottom left
fixes interface error in comparestacks and handles RGBA stacks
Add support for RGBA-formatted superpixels in Raveler
Merge pull request #7 from jni/fix-rgba-sps

Add support for RGBA-formatted superpixels in Raveler
Initial doc write for evaluate functions
Add docs to two more functions
Change image-reading backend for speed improvements
Add doc for contingency_table
Add doc for rand_values function
Tweak and document edit_distance functions

They gain a size_threshold kwarg to ignore small merges and splits.
Update doc and function for relabel_from_one
Document rand_by_threshold function
Add documentation for special points functions
Add documentation for VI functions
Add references to synapse geometry package