Add e2e tests to travis

[PaulL1]

Looks like we're sometimes breaking e2e tests without knowing it - I don't want to have to check out every PR and run the e2e by hand, it'd be nicer if travis told us when it was busted.

[c0bra]

I'm assuming you meant travis instead of jenkins, but if we suddenly started using jenkins then that'd be interesting!

I'm looking into getting e2e tests to run on travis,