merge .ravis.yml

Author: jaehong-kim

.travis.yml

@@ -2,7 +2,6 @@ language: java
 
 jdk:
   - oraclejdk7
-  - openjdk6
 
 env: JAVA_6_HOME=/usr/lib/jvm/java-6-openjdk-amd64 JAVA_7_HOME=/usr/lib/jvm/java-7-oracle JAVA_8_HOME=/usr/lib/jvm/java-8-oracle