Update travis config and add maximum build time to each build / job.
Update travis config and add maximum build time to each build / job.

This way we fail the build and alert the user if a build takes longer
than the specified amount.

If build consistently fails with this error it likely means that a large
performance regression has been introduced in the code.

Plexxi/st2,StackStorm/st2,Plexxi/st2,nzlosh/st2,nzlosh/st2,StackStorm/st2,Plexxi/st2,nzlosh/st2,StackStorm/st2,nzlosh/st2,StackStorm/st2,Plexxi/st2