Added portion to clean mask
Reworded a doc string.
Added function to clean cc mask
NF: New function to clean coarse corpus callosum segmentation.
RF: Restored thresholds.  Moved full corpus callosum segmentation to end.
BF: Added newline at the end of the file.
Merge pull request #252 from klchan13/clean_cc

Clean cc
Added Examples in doc/examples/reconst_canal.py
tests fixed
First Draft of Mauro Shore
updating canal.py
BF: multi_voxel_model was changed to multi_voxel_fit in canal.py
add b0 image, calculate odf directly on the sphere
fixed bugs, add cache for shore_matrix_pdf and shore_matrix_odf
added b0 and odf on the sphere.
add comments in canal.py
add comment and refernces in voxel.py for pdf, rtop and msd
add example for the metrics of canal.py rtop and msd
fixed indentation
fixed indentation