fix yobi-120, yobi-108, yobi-97, yobi-67

- yobi-120: show .mass-update-check when .mass-update-form available
- yobi-108: remove placeholder in issue list search
- yobi-97 : adjust .dropdown line-height in issue view
- yobi-67 : $yobi.loadModule didn't work on FireFox
Fix an exception while getting watchers for issue.

Fix an exception while getting watchers if the author's account is
removed, by making User.getAuthor() returns anonymous if the user does
not exist.
notification: Introduce WatchService.

You can implement Watch feature for any Resource with the WatchService.

WatchService absorbs many facilities which originally Issue, Posting,
Commit and Project had for providing watching feature.

To do that, this commit make some changes on Resource as below:
* The type of Resource's id has changed from Long to String.
* ResourceParam, which implements QueryStringBindable, is added to
  easily pass a Resource to controller.
Merge pull request #142 from npcode/yobi refs/heads/fix/watch-service
code: Fix the incorrect number of comments.
Merge branch 'master' of http://hive.nhncorp.com:80/dlab/hive into fix-css-130812

Conflicts:
	app/views/code/nohead.scala.html
	conf/messages.en
	conf/messages.ko
metion: fixed NPE

* NPE occured if there was no commits like old closed pull-requests
pullrequest: show comment counts on list
add japanese language support
convert HTML entities in commitMsg on codeBrowser
simple-comment: now you can delete simple comment
Merge pull request #102 from laziel/yobi refs/heads/fix-css-130812
Merge pull request #145 from laziel/yobi refs/heads/i18n-ja
Merge pull request #146 from laziel/yobi refs/heads/fix-codebrowser-130814
feedback button moved to bottom-right