Add travis file

.travis.yml

@@ -0,0 +1,33 @@
+language: android
+
+android:
+  components:
+    - tools
+    - platform-tools
+    - build-tools-25.0.2
+    - extra-android-m2repository
+    - android-25
+  licenses:
+    - 'android-sdk-license-.+'
+
+jdk:
+  - oraclejdk8
+
+branches:
+  except:
+    - gh-pages
+
+notifications:
+  email: false
+
+sudo: false
+
+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/
+    - $HOME/.android/build-cache