Update travis config

.travis.yml

@@ -1,12 +1,16 @@
 language: java
 jdk:
   - oraclejdk8
+before_cache:
+  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
 cache:
   directories:
-    - .autoconf
-    - $HOME/.m2
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
 script:
-  - mvn clean package -Pci
+  - ./gradlew check
+  - ./gradlew clean build -x test
 branches:
   only:
     - master