Intent - Extension methods in order to chain the calls

[fbencosme]

I think, would be nice if we can do something like :

IntentFor<MyActivity>(context).start(context)

IntentFor<MyActivity>(context)
   .putExtra("name", value)
   .addFlags(Intent.FLAG_ACTIVITY_NEW_TASK)
   .start(context)

or

IntentFor<MyActivity>(context)
   .putExtra("phone", phone)
   .startForResult(activity, MyReqCode )

[pawegio]

Thanks for contribution. Just added your extension functions. I'll soon upload changes with new version to bintray.