Support api version

Now it is possible to specify which api you want to use. For those whose specified api version in the path before it should still work? if not please file

how to post on behalf of app

Post to Facebook with app credentials

Access public data without access token with Facebook

Not sending null access token so Facebook class can use to access public data

Support POST and DELETE

Adding POST and DELETE possibility. Application can now publish, update and delete post on Facebook.

Search method for wrapping Facebook search

A single search with params object which should have properties according to https://developers.facebook.com/docs/graph-api/using-graph-api#search