Merge pull request #18 from sjrd/setup-travis-cache

Setup Travis cache.

Author: sjrd

.travis.yml

@@ -16,3 +16,12 @@ jdk:
 env:
   - SCALAJS_VERSION=0.6.18
   - SCALAJS_VERSION=1.0.0-M1
+
+cache:
+  directories:
+    - "$HOME/.ivy2/cache"
+    - "$HOME/.sbt"
+before_cache:
+  # Cleanup the cached directories to avoid unnecessary cache updates
+  - find $HOME/.ivy2/cache -name "ivydata-*.properties" -print -delete
+  - find $HOME/.sbt -name "*.lock" -print -delete