Add build task to travis script

Author: Vignesh Raja

.travis.yml

@@ -7,7 +7,7 @@ before_script:
     - git config user.email "noreply@travis-ci.org"
     - git checkout $TRAVIS_BRANCH
 script:
-    - './gradlew clean check --debug'
+    - './gradlew clean build check --debug'
     - '[ "${TRAVIS_PULL_REQUEST}" != "false" ]  || ./gradlew release -Prelease.useAutomaticVersion=true'
 env:
   global: