fix travis CI build

[jmwample]

travis CI is broken and errors on building android app

build process is probably out of date from what Psiphon sent in the past.

[sergeyfrolov]

We need to fix the build in dark-decoys and master branch:

• dark-decoys: Fixed in Travis build #17
• master: not fixed yet.

[jmwample]

Master fixed in commit d6cb372

• conjure: Fixed in Travis build #17
• master: fixed in d6cb372