Merge pull request #132 from SethTisue/travis-caching

speed up Travis builds using caching feature

Author: SethTisue

Diff for: .travis.yml

@@ -20,3 +20,12 @@ jdk:
 
 notifications:
   email: [email protected]
+
+before_cache:
+  - find $HOME/.sbt -name "*.lock" | xargs rm
+  - find $HOME/.ivy2/cache -name "ivydata-*.properties" | xargs rm
+cache:
+  directories:
+  - $HOME/.ivy2/cache
+  - $HOME/.sbt/boot
+  - $HOME/.sbt/launchers