Add /tmp directory, but nothing IN it

Add /tmp/.keep so that git knows about the directory

BUT

Do not track anything in tmp
change password hash on user migration to password digest
Merge branch 'master' of https://github.com/tiger-swallowtails-2014/JobThing into UserAuthentication
include Bcrypt on the gemfile
modify user model for bcrypt implementation
change user#index to be sign in page and user#show to be the home page
modify session controller for user sign in and sign out
mofify user controller for sign up
Successfully implement user sign up
Merge pull request #17 from tiger-swallowtails-2014/UserAuthentication

User authentication