Added template tag Node for unjoined groups for a user
Fixing pep8 issues and removing print statements
Fixing travis errors
using split_contents(), removing import re, adding docstrings for the template tag
adding try/catch to show template errors, added to check the user
Merge branch 'master' into TemplateTagNode_for_Unjoined_groups
Fixing lint issues, branch based off master
Cleanup

* Try/except should be used in minimal code block so it doesn't
accidentally catch something we don't want it to catch.
* Removed print statement
Merge pull request #58 from agiliq/TemplateTagNode_for_Unjoined_groups

Template tag node to get unjoined groups for a user