Update af.accordion.js

Plugin was not working with the latest AppFramework branch. 
Enhancement: If data-height is not specified then set to auto.

There is still "event.returnValue is deprecated." warning which I cannot figure it out.
Update af.accordion.css

Plugin was not working with the latest AppFramework branch. 
Enhancement: If data-height is not specified then set to auto.

Also requires af.accordion.js changes.
Merge pull request #11 from KishanRathod/patch-1

Update af.accordion.js