Update travis file to use emulator and run tests

.travis.yml

@@ -9,6 +9,7 @@ android:
     - build-tools-23.0.2
     - build-tools-23.0.1
     - android-23
+    - sys-img-x86-android-23
     - extra-android-support
     - extra-google-m2repository
     - extra-android-m2repository
@@ -24,8 +25,15 @@ cache:
     - $HOME/.gradle/caches/
     - $HOME/.gradle/wrapper/
 
+# Emulator Management: Create, Start and Wait
+before_script:
+  - echo no | android create avd --force -n test -t android-23 --abi x86
+  - emulator -avd test -gpu off -no-window &
+  - android-wait-for-emulator
+  - adb shell input keyevent 82 &
+
 before_install:
   - chmod +x gradlew
 
 script:
-  - ./gradlew build check
+  - ./gradlew build check testDebugUnitTest connectedDebugAndroidTest