Before this fix: environment variables defined `.travis.yml` were still
dependant of internal configuration of the travis worker virtual
machine. See also previous pull request #1728.
With this fix, `.travis.yml` is even more generic and portable.
Before this fix:
* Build PATH has recently changed on Travis CI and hard-coded values in `.travis.yml' were no more valid (the `builds` folder has been renamed as `build`)
* Any contributor that forked the main project repository had to modify the definition of environment variables in order to integrate with http://travis-ci.org
With this fix cappuccino is correctly configured to be built on Travis CI and makes `.travis.yml` more generic (forkable).
Alexander Ljungberg
Gilles Cornu
Aparajita Fishman
Andrew Hankinson