Use 2.11.0 for the travis build

We'll need to add 2.12.0-SNAPSHOT once we have nightlies
published from the 2.12.x branch.
Bump versions after the 2.11.0 release.

The release job does this dynamically, so this doesn't correct
an error. Rather, it just brings things up to date in development
mode.
Bump to 1.0.1-SNAPSHOT

1.0.0 is released already.
Workaround for scalaBinaryVersion handling for 2.12.x

This will be rolled into sbt-scala-modules soon, but I'd
like to get the ball rolling here.