Remove unused code
Make Dummy adapter the only REPL implementation
Remove ActiveRecord and mutex from REPL class
Let the middleware handle repl_session routes
Move REPLSession model to lib/
Remove unneccessary engine stuff
Remove irrelevant tests
Merge pull request #16 from ryandao/cleanup

Cleanup
Add homemade js console
Add caret manipulation
Automatically scroll to console bottom
Remove all jquery reference
Mutate RESCUES_TEMPLATE_PATH instead of redefine
Add ctrl-P and ctrl-N for navigating history
Encapsulate localStorage & minor styling fix
Make the console focused by default