upgrate rails to 4.2.0
emjoi asserts
add responders gem
using active job
add sign_in logging
remove logs updated_at column
fix story new and edit page broken issue
fix story type and tag issues
fix task edit bug
refactor projects_controller and fix some related bugs
clean up chonglou's old code to fix project index bug, and add params security check for project id
partially support number story_type and story_tag
do not really destroy records