milestone: enhancement issue management

- unify issue management of issue list & milestone issues
- change button message to be clear
- add issue delete button disabled style
milestone: fix wrong badge num color
Merge pull request #245 from doortts/enhancement/milestone-issue-management

milestone: enhancement issue management
Adding mew milestone on Issue-Edit page, only if there was no milestone
Merge pull request #246 from wansoon/issue

프로필 수정 페이지 버그 수정
minor CSS changes

* fix line-break on .nbtn (IE9)
* fix broken UI on userinfo (IE9)
* enhance project fork form
* enhance code browser UI.
Merge pull request #247 from laziel/fix-minorcss-130612

minor CSS changes
improvement readability of comments & milestone tag
fix missing trailing }
minor ui change of milestone tag in listing
fix #238 : add empty email check