puma config
config puma to run in daemon
increase database pool for prod
enable multiple thread for rails
appearance update: narrower side bar
admin panel improvement

- masquerade tab
- role request tab
tutor column for students page
remand 'for staff only' to 'admin functions'
avoid divide by 0 when level thread hold is 0
redirect user back to request url after auto authenticate through Facebook
precompiled assets for production
delayed job config
fixed comment email url invalid bug
course preference settings for mission, training and sidebar
fix for sidebar display bug

when an admin goes to a course he is not enrolled or created
fix bug when sidebar count is nil
support mobile for settings drop down list
precompiled assets
settings bar mobile support : no click
show course teaching for tutors at home page