support standard markdown syntax, lheading and hr tag
enhance file uploader. fix pull request form CSS.

- file uploader now available on OSX Safari
- clipboard image can be uploaded
- file uploader applied on pull-request form
- repositioned file uploader with comment-form
build fix
add check all for issue list
Merge pull request #439 from nforge/build

build fix
Merge pull request #437 from laziel/file-uploader-130802

파일 업로더 개선 등
Merge pull request #436 from insanehong/env/markdown-standart-syntax

support standard markdown syntax, lheading and hr tag
Merge pull request #438 from insanehong/issue/issue-selectall

이슈 리스트 모두 선택 기능 추가