Start using URITemplates in the classes
Tests pass. Fixtures updated to a degree.
Added pull requests issue comments method.
Merge commit 'github/pr/117' into develop
Deprecate str(Contents())

Closes #92
Add StackOverflow link
PEP 257
PEP257 for github3.gists
PEP257 for github3.api
Add new logo
Stricter requirements
Merge branch 'develop' into uritemplate

Conflicts:
	setup.py
Ternaries are awesome!
Lint!
Start adding templates to Repository objects
Add more templates to Repository

Add to the documentation for each what can be used for expansion.
Covered all the exisiting templates on repos
Update Users URITemplates and their docs

Also add a few non-template URLs to Gist objects.
Make underlying template object slightly more obvious

Add a `t` to the end of templated objects
Add templates to issues