Add Gravatar tutorial
Merge branch 'master' into gravatars

Conflicts:
	tutorials/index.rst
Added gravatars

- Filled out the gravatars tutorial
- Added the model method and tests to myblog/
Do not show class when defining new methods
Add note about calculating MD5 hash
Change grammar
Add note about importing hashlib library
Fix MD5 capitalization and "128-bit"
Merge pull request #75 from pythonsd/gravatars

Add Gravatar tutorial