Click handler was also attaching to “Select Attachments” button, so
modified selector to grab #issue-reply-btn by ID and submit button

Make `#attached-list` attachment labels wrap, make spacing more
consistent, add hover stats to `.attachment-remove` icon, adjust
padding of labels to compensate for `.attachment-remove` icon

Save comment/issue drafts in sessionStorage.

Fix #318. Issues attachments: allow Select Attachments to append files

Fix #321. Allow empty comments as long as there are attachments.

Fix #312. Quote file names of attachments.

Fix #313. Repair broken image extension detection regex.

Fix #319 (user not-logged in error)

Fix #303. Specify updated columns explicitly.

[Trello#244] Mention all members of team by mention team name

Feature: Ability to attach files to issues (attachments)

Fix double decrement of issue counter

Conflicts:
	models/issue.go
	routers/repo/issue.go

Fix #302. Show referencing commits in issue.

Update milestone issue stats when reopening/closing issue

Fix #216. Change milestones, labels and assigne without reloading the page

Fix issue #278. Fall back to (default) branch for context data, if no branch selected

Fix issue #288. Only show label form if repository collaborator/admin

Fix issue 280 & unwatch button in Firefox