add karma testing configure and setup karma testing example
    1. npm install -g karma, then should add karma to our PATH
    2. edit the karma configure
    3. karma start
    4. karma run
test the service and everything seem working
add db seed file to generate testing data.
add script to gen testing data.
WTF, forgot the "/" in the URL
add the group add button
    1. ng-show not working well
    2. no actually action taken yet when click add button
add the group add button
    1. ng-show not working well
    2. no actually action taken yet when click add button
create the assosiation between checkout and group
    1. group.checkouts works now
disable the current_user checker right now for develepment
just pretty it