set problem id colour instead of the check symbol
replace the style, and add important anti the table style
fix nav-pills center in problem show
remove reset button on submit page
Merge pull request #20 from dotkrnl/layout

fix nav-pills center in problem show
fix contest header centering
fix layout of submit page
Merge pull request #21 from dotkrnl/layout

fix layout for contest and submit page
add basic unit tests
when user add a topic or add new reply, should submit at least a problem
fix mail list not showing receiver bug
refactor the code about new submit
fix a bug about user permission defunct
fix #23, get_user will return a fresh user from database
fix register page bugs and show errors
Merge pull request #25 from dotkrnl/register_error

fix register page bugs and show errors
Merge pull request #24 from dotkrnl/mail_bug

fix mail list not showing receiver bug
use self::DEFUNCT_NO replace hardcode
add user permission edit for admin
Merge remote-tracking branch 'upstream/master' into i18n

Conflicts:
	application/classes/Controller/User.php
	application/views/contest/header.php
	application/views/problem/list.php
	application/views/problem/submit.php