Update README.md
Removed submodule bootswatch
Updating to '3.1.1'
Update to new themes available.
Check for 'assignment' nil on './rearranges'
Link text on Yeti.
Rearranges on 'amelia'.
Rearranges on 'cerulean'.
Rearranges on 'cosmo'
Rearranges on 'cyborg'.
Rearranges on 'darkly'.
Rearranges on 'flatly'.
Rearranges on 'journal'.
Rearranges on 'lumen'.
Rearranges on 'readable'.
Rearranges on 'simplex'.
Rearranges on 'slate'.
Rearranges on 'spacelab'.
Rearranges on 'superhero'.
Rearranges on 'united'.