Style finesse for “Attachments:” list in issues

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
Fix for erroneous Submitting mode on button

Click handler was also attaching to “Select Attachments” button, so
modified selector to grab #issue-reply-btn by ID and submit button
Small whitespace cleanup
Fix “Submitting” state of Close issue input

If .btn-default isn’t removed, .btn-default and .btn-warning styles
conflict
Fix typos
Use console.log instead of breakpoint
Trivial cleanup

using `event.preventDefault` instead of `return false` for being more
explicit
Semicolons for consistency ;);