Convert project from ant to gradle

.travis.yml

@@ -1,9 +1,16 @@
 language: android
-android:
-  components:
-    - build-tools-21.1.1
-    - android-17
-script:
-    - echo "Travis branch is $TRAVIS_BRANCH"
-    - echo "Travis branch is in pull request $TRAVIS_PULL_REQUEST"
-    - ant debug
+sudo: true
+
+install:
+- echo y | android update sdk -u -a -t tools
+- echo y | android update sdk -u -a -t platform-tools
+- echo y | android update sdk -u -a -t build-tools-25.0.2
+- echo y | android update sdk -u -a -t android-25
+- echo y | android update sdk -u -a -t extra-google-m2repository
+- echo y | android update sdk -u -a -t extra-android-m2repository
+
+script: ./gradlew assembleRelease testReleaseUnitTest lintRelease
+
+after_failure:
+- cat app/build/reports/findbugs/findbugs.html
+- cat app/build/reports/tests/debug/index.html