gh-1196.

Cherry picked from 2.0 master 34c4e122

Conflicts:
	src/exports.js

(cherry picked from commit 5b59a63b)

(cherry picked from commit 1f530e28)

(cherry picked from commits 1083f82d 8be9cd1c 054c6946)

http://semver.org/

(remember to `npm install`)

 responseXXX fields are set on the jqXHR. Close gh-1164.

(cherry picked from commit b55bfb14)

Follows-up 22e28b01.
(cherry picked from commit 31478b90)

If the event type is an empty string we end up hanging in .off() which makes for
mighty hard debugging. Instead treat it as a no-op. Docs seem clear this is not
allowed.

(cherry picked from commit 59f5adb6)

(cherry picked from commit 6a0ee2d9)