add travis status.
add travis status.

aitboudad/Payum,digisec/Payum,digisec/Payum,fullpipe/Payum,fullpipe/Payum,staabm/Payum,StoreFactory/Payum,formapro-forks/Payum,StoreFactory/Payum,Payum/Payum,Payum/Payum,StoreFactory/Payum,ASKozienko/Payum,formapro-forks/Payum