Deleted duplicated script using event delegation.
DRYed up gist file input form.
Fixed the problem that Ace editor was not applied to newly added files.
1.2.2 CHANGELOG
Made the ids of gist file inputs and textareas unique.
Merge branch 'ace_for_new_form' of https://github.com/shuhei/gistub into develop

Conflicts:
	app/views/gists/_form.html.erb
	app/views/gists/_gist_files_input.html.erb
Updated CHANGELOG