added dropzone.js and moved javascript loading to bottom of page
fixed parent column so it can be null
posts' parent can be null
added attachments to gitignore
initial dropzone implementation
initial attachments endpoint commit
updated with attachments routing
added public column to attachments
added indexes to attachments for id and type
added email+password index to users table
uploads work correctly from jquery
uploads work and thumbnails display correctly.
initial tests pass for Attachment CRUD
moved request.accept stuff into before(...) method
added factorygirl definition initialization and databasecleaner calls
removed test_preparation helper since we are now setting up and tearing down in the rspec config
updated Gemfile to include capybara for testing
added capybara requires
initial capybara tests pass
capybara tests pass for category js