add postgres setup
Merge pull request #2 from instructure/travis

add postgres setup for Travis CI
readme with cute travis badge
Merge pull request #3 from instructure/readme

readme with cute travis badge
created user migrations
add accountable
Paper Trail
slack integration
added user models
add belongs_to to student/teacher model
added devise gem
faker gem
generate devise Account
limit the number of versions
versions controller created for notebooks
renamed files
We can view versions now
Fixed versions controllers
Merge branch 'paper_trail' of github.com:instructure/note_tree into paper_trail
fixed bad naming in specs for version helper