Updated README with is* and can* methods, and before callbacks too
Updated README with is* and can* methods, and before callbacks too

sergiou87/StateMachine,brynbellomy/StateMachine-GCDThreadsafe,brynbellomy/StateMachine-GCDThreadsafe,luisobo/StateMachine,sergiou87/StateMachine,luisobo/StateMachine