use json as the request body of `/api/users/activate`
Merge pull request #23 from iTakeshi/activation_via_json

use json as the request body of `/api/users/activate`
use json as the request body of `/api/users/activate`
remove public
switch to gulp from grunt
update .gitignore
update bower.json
use gulp
add static dir
add vendor dir
add activate page
reform stracture
move to client/vendor
reform-structure
add admin page for user
add admin page for class year
refine admin page
add help page
add signup page
refine main page