Add a travis.yml file so that the tests run properly on Travis
Add a travis.yml file so that the tests run properly on Travis

This is largely based on the work that Matthew Somerville did to
get the MapIt tests running on Travis.

geoffkilpin/pombola,geoffkilpin/pombola,patricmutwiri/pombola,ken-muturi/pombola,geoffkilpin/pombola,hzj123/56th,mysociety/pombola,mysociety/pombola,hzj123/56th,ken-muturi/pombola,geoffkilpin/pombola,ken-muturi/pombola,hzj123/56th,mysociety/pombola,geoffkilpin/pombola,ken-muturi/pombola,ken-muturi/pombola,patricmutwiri/pombola,patricmutwiri/pombola,ken-muturi/pombola,patricmutwiri/pombola,mysociety/pombola,geoffkilpin/pombola,hzj123/56th,hzj123/56th,mysociety/pombola,mysociety/pombola,hzj123/56th,patricmutwiri/pombola,patricmutwiri/pombola