Emit a flag when opening/closing

Emit a new boolean flag to indicate if the accordion item is changing state on:

• open
• opened
• close
• closed

0.1.2

require less shims for IE8/9

0.0.11

updated transition-auto dependency to solve some minor bugs

0.0.10

updated to handle transition when already open/closed better

0.0.9: Merge pull request #1 from jameslnewell/master

Added `open`, `opened` and `closed` events, a transitioning class and a working example