Added Travis CI as additional service (#2373)

.gitignore

@@ -8,6 +8,7 @@
 !gradlew.bat
 !build.gradle
 !gradle.properties
+!.travis.yml
 
 # include markdowns
 !README.md

.travis.yml

@@ -0,0 +1,16 @@
+language: java
+jdk:
+  - oraclejdk8
+  - oraclejdk7
+  - openjdk7
+
+before_cache:
+  - rm -f  $HOME/.gradle/caches/modules-2/modules-2.lock
+  - rm -fr $HOME/.gradle/caches/*/plugin-resolution/
+cache:
+  directories:
+    - $HOME/.gradle/caches/
+    - $HOME/.gradle/wrapper/
+
+install: "./gradlew setupCIWorkspace"
+script: "./gradlew build test"