Only deploy snapshots from master branch builds.
Merge branch 'master' of https://github.com/tomfisher/playn
Move the clone into the deploy script.
Unused import
It appears sh isn't bash on the travis machine.

But the script still merrily exited with a zero status
despite choking.
In fact, let's bash -e to make errors appropriately fatal
Deployment should be on after_success, not script

Using "script" overrode the default test task, so
it a) wasn't running the unit tests and b) was deploying
snapshots regardless of how bad things might be.
Use the module base as the default path prefix for HtmlAssets.