siteAdmin: Add Mass Mail feature.

This feature allows Site Administrator to send emails to many users.
Fix an inappropriate comment.
code: Fix "copying url to clipboard" does not work

This is regression that introduced by 5a9c5f4.
change: add project logo support image file ext type "jpeg"
Merge pull request #38 from laziel/master

HIVE-163 파일 업로드 버튼 CSS 수정 외 HIVE-182, HIVE-176 추가 수정
log: Make logging to logs/application.log work.
fix: fileUpload error for issue/board edit page
add created date on project list
comment: Fix a bug attachments are not deleted.
Merge pull request #39 from wansoon/HIVE-159

HIVE-159 게시글 파일업로드 후 수정화면에서 파일목록이 나오지 않음
massmail: Add missed hive.site.MassMail.js

This file should have been added in 9790204.
issue: bugfix for downloading issues as excel.

An internel server error has been occured while trying to download
issues as a excel file because of the file does not exist. The reason of
the error is lack of the directory in which the excel file is saved, so
the error may be fixed easily by just creating the directory.

But I have found that saving excel file in a directory is not safe at
all because the directory is public so cannot be access-controlled. To
solve this problem, I have changed the form of excel data generated by
Issue model, from a regular file to byte array, to make them be in the
memory, not a directory.
Merge pull request #40 from npcode/fix/save-issue-as-excel

issue: bugfix for downloading issues as excel.
project: Fix typeahead for tags.

hive.ui.Typeahead accepts only list of string.
HIVE-190 adding posts and issues view page for site admin
add google analytics code for nhnnext

It should be removed before public release
change some minor ui

- make project name bold in project list page
- change project creation time expression to ago string
fix:
1. state sorting error on milestone edit page
2. completion rate sorting error on milestone list page
Merge pull request #41 from keesun/HIVE-190

HIVE-190 사이트 관리자가 모든 이슈글, 모든 게시글을 볼 수 있는 페이지 추가
Merge pull request #42 from wansoon/HIVE-192

HIVE-192 마일스톤 보기에서 '완료율 순'을 누르면 에러