Summary:
rename FLEXNetworkLib to SKFLEXNetworkLib so it doesnt clash with Stock FLEX if embedded in the app too
also 'fix' 3 warnings by adding explicit casts
Reviewed By: lblasa
Differential Revision: D35200011
fbshipit-source-id: 82bdecc5076b86958ea0cb80260584c012940045
8cbb5c4d46