Allowing parameters to be passed to facebook graph requests.

*Allows parameters in IOS and Android facebook graph requests.
*Modified Android graphRequest to be asynchronous, like the IOS verison.
*Fixed a null pointer issue in IOS facebook getSession
*Adding REQUEST_RESPONSE_FAILED call back for graph requests.
*Updating doc comments.
*Adding JniUtils for common JNI operations.

In the future I'd like to see a means of passing what request the call
back is for as well as more information about errors that occured.
Merge pull request #741 from JandyCo/facebook-graph-parameters

Allowing parameters to be passed to facebook graph requests.