fileUploader has enhanced

* new UI applied
* Drag&Drop file to upload
Merge branch 'master' of https://github.com/nforge/hive into file-uploader

Conflicts:
	public/javascripts/common/hive.FileUploader.js
	public/javascripts/service/hive.issue.View.js
	public/javascripts/service/hive.issue.Write.js
Merge pull request #190 from laziel/file-uploader

파일 업로더UI 개선, Toast UI 문제 수정
- 아! 멋지다!! 쓸 생각을 하니 떨려요!! 이 기능!!