Merge pull request #2 from abcm1989/master

basic snippets model and controller
pulled changes to user and controller model
Add new associations to Cheatsheet model
Merge pull request #3 from postmodem/Cheatsheets

Add new associations to Cheatsheet model
added migration and models for tags, snippet_tags, cheatsheet_tags
'pulled down changes to cheatsheet model'
Merge branch 'master' of https://github.com/woolly-bear-caterpillars-2014/snippets