Updated SBT version and travis config.

Author: manub

.travis.yml

@@ -15,10 +15,10 @@ cache:
     - $HOME/.sbt/boot/
 
 before_cache:
-  # Tricks to avoid unnecessary cache updates
-  - find $HOME/.ivy2 -name "ivydata-*.properties" -delete
-  - find $HOME/.sbt -name "*.lock" -delete
+  # 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
 
 script: 
-  - sbt ++$TRAVIS_SCALA_VERSION embeddedKafka/test kafkaStreams/test
+  - travis_retry sbt ++$TRAVIS_SCALA_VERSION test