Merge branch 'develop'
Updated the corgy tutorial
Created a new array to hold all the atoms that are in a side chain
examples/visualize_cg.py
Added 1y26.cg as an example
Updated documentation to provide an example of using coarse_grain visualization
Renamed everything to forgi
Added some files I missed in the rename process
Renamed corgy to forgi in the documentation
Directory structure rearrangements
More directory structure rearrangements
More directory structure rearrangements
Error message when a file doesn't exist
Added all of the ideal stem data.
Fixed a bug in the biggest stem chooser
examples/input/1y26.pdb
Fixed two minor bugs