Querying GitHub api is unreliable on Travis so it fails nondeterministically

Gulp uses bower to pull the dependencies and probably does some pre-flight http requests, this leads to GitHub responding with 403 and failing our build, because there is a request limit for GitHub api and it's probably subnet based (speculation) or travis containers are behind NAT with the same public IP.

Whatever the reason is, we need to use the Oauth token when doing the rest calls against the GitHub api.