Moved rspec rails to dev/test group

It used yo be in the doc group.
added empty user (model + migration)
added ruby-bcrypt to gemfile
added factory girl rails to gemfile
added basic user factory
added simple user spec testing fields
Added specs for user name
added email validation + specs
added password validation spec
added authentication validation spec
added user#access validation and spec
added session helper with specs
added generated sessions controller

Actions are new, create & destroy

This controller will be used to log in a user
Fixed sessions views not being in the right space
added /login route (points to sessions#new)
Merge branch 'user_system' of github.com:beraboris/rails4_teacher_evaluation into user_system