Merge pull request #56 from hazendaz/master

[travis] Remove java 6 as we support java 7+ now

Author: hazendaz

.travis.yml

@@ -5,7 +5,6 @@ jdk:
   - oraclejdk8
   - oraclejdk7
   - openjdk7
-  - openjdk6
 
 after_success:
   - chmod -R 777 ./travis/after_success.sh