TryGhost/Ghost — pull request #4457 by jaswilli (2014-11-15 04:46:59+00:00)
Title: Fix post tags input.

Closes #4378. Closes #4455.
- Trim whitespace from tag names on entry.
- Prevent duplicate tags in suggestion list.
- Fix unhandled exception that happens when backspace is pressed in
an empty tags input box.