.travis.yml: Don't run long-running tests.
.travis.yml: Don't run long-running tests.

mrjbq7/factor,factor/factor,bpollack/factor,AlexIljin/factor,tgunr/factor,mrjbq7/factor,mrjbq7/factor,bpollack/factor,factor/factor,factor/factor,tgunr/factor,bpollack/factor,factor/factor,factor/factor,AlexIljin/factor,AlexIljin/factor,bpollack/factor,tgunr/factor,bpollack/factor,tgunr/factor,bpollack/factor,AlexIljin/factor,AlexIljin/factor,tgunr/factor,AlexIljin/factor,tgunr/factor,AlexIljin/factor,mrjbq7/factor,mrjbq7/factor,factor/factor,bpollack/factor,mrjbq7/factor