Fixed travis.yml due to Oracle's withdrawal

Author: SzymonStankiewicz

.travis.yml

@@ -1,4 +1,5 @@
 before_script:
+ - sudo apt-get install ant-optional
  - export OPTS="-server -Xmx3072M"
  - export JAVA_OPTS="${JAVA_OPTS} ${OPTS}"
  - export ANT_OPTS="${ANT_OPTS} ${OPTS}"
@@ -9,12 +10,12 @@ language: java
 
 jdk:
   - oraclejdk8
-  - oraclejdk7
+#  - oraclejdk7
 #  - oraclejdk6
 
 #  - openjdk8
   - openjdk7
-  - openjdk6
+#  - openjdk6
 
 env:
   - TEST_SUITE=run_tests