Update travis config to not install composer dependencies from source
Update travis config to not install composer dependencies from source

CSBill/CSBill,pierredup/SolidInvoice,CSBill/CSBill,pierredup/CSBill,SolidInvoice/SolidInvoice,SolidInvoice/SolidInvoice,pierredup/CSBill,SolidInvoice/SolidInvoice,pierredup/CSBill,CSBill/CSBill,pierredup/CSBill,CSBill/CSBill,pierredup/SolidInvoice