Change dropdown style for label edit in issue view
Project: fixed a bug

While deleting a project, there is a server error which is caused by deleting Pull-Requests before deleting Comment-Threads.

Delete Comment-Threads and related Reviewe-Comments before deleting the Pull-Requests.
Markdown: modify autolink rules - suppoort uppercase string
Issue: arrange label, vote, watch button positions
Issue: improve voters list
Board, Git, Milestone: arrange button positions

- place Watch button on left bottom of content, same with Issue
- place List button on left bottom of document
- place Help button on right bottom of document
Review: form placement has changed

place .review-form after target as sibling
instead of hovering layer.
Diff: add defensive code for illegal argument
Merge branch 'issue/project-mention' of insanehong/hive

from pull request 962
Merge branch 'fix-issueview-140508' of laziel/yobi

from pull request 955
Remove mergely.js
Merge branch 'fix-reviewform-140507' of laziel/yobi

from pull request 949
util: Make getFirstValueFromQuery more tolerant

Make HttpUtil.getFirstValueFromQuery more tolerant to protect Yobi from
common mistake by API users.

* Do not return null. It may cause "null" string in query string, such
  as "redirect_to=null"
* Return "" if the query is null, to prevent a common mistake that pass
  a null query and get a NPE.

This also fixes a NPE when the client tries to login with an unusual
HTTP body whose content type is multipart/form-data but not
application/x-www-form-urlencoded specified by the HTML form provided by
Yobi.
Merge branch 'fix/npe-if-request-login-with-multipart-form' of npcode/yobi

from pull request 963
Review: place folded thread btn in proper position
refactoring: yobi.Markdown.js
mention: change default mention size 5 to 10
mention: add project/group mention

   Now, a user can mention project's whole members or whole organization members
   by its name for notification.
mention: add issue mention feature

  Now, a user can mention project issue by issue number and title
Merge branch 'fix/mention' of doortts/yobi

from pull request 965