Fixed the comments in reconst_dsi_metrics.py
adding the references
add the refernces in reconst_dsi_metrics.py
modify the refernces in reconst_dsi_metrics.py
Merge pull request #249 from maurozucchelli/dsi_metrics_2

Dsi metrics 2
Added portion to clean mask
Reworded a doc string.
Added function to clean cc mask
NF: New function to clean coarse corpus callosum segmentation.