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.

Author: retronym

.travis.yml

@@ -2,7 +2,7 @@ language: scala
 script:
   - sbt ++$TRAVIS_SCALA_VERSION clean update compile
 scala:
-  - 2.11.0-SNAPSHOT
+  - 2.11.0
 jdk:
   - openjdk6
   - openjdk7