Merge pull request jaubourg#27 from chandranshu12/patch-1

Update README.md to fix License and Download links

Determine head.firstChild at each new request. fixes #1 (hopefully, g…

…iven I've never been able to reproduce it). Version incremented to 2.3.1.

Promote the xOptions object to a Promise for jQuery versions that pro…

…vide $.Deferred objects. Welcome $.when( $.jsonp( options ) )! Unit tests added. Version upgraded to 2.3.0.

Upgrade version and release date.

First jquery jsonp version hosted on github (2.2.0)