added auth notes
Merge branch 'master' of github.com:wdi-sf-jan-2014/notes

Conflicts:
	README.md
edits and added diagram
edits and added diagram
Update UserSessionsAndAuth.md
Update UserSessionsAndAuth.md
Update UserSessionsAndAuth.md
Update UserSessionsAndAuth.md
edits and added diagram
Update UserSessionsAndAuth.md
Update UserSessionsAndAuth.md
Update UserSessionsAndAuth.md
Update UserSessionsAndAuth.md
Adding notes for migrations and assocations
Adding the college app that is created in the association notes
Adding the products and categories lab.  The goal is to create an app that demonstrates a many to many relationship.
Making some minor corrections to the migrations and associations notes
Update products_and_categories_associations_lab.md

Adding read to requirements #1 and #2.
Update products_and_categories_associations_lab.md

Adding some hints
Update products_and_categories_associations_lab.md

Adding hint on separate lines