Only build lib on CI

.travis.yml

@@ -27,9 +27,12 @@ before_install:
   - echo no | android create avd --force -n test -t $ANDROID_TARGET --abi $ANDROID_ABI
   - emulator -avd test -no-skin -no-audio -no-window &
 
+install:
+ - ./gradlew :lib:build
+
 before_script:
   - adb wait-for-device
   - adb shell input keyevent 82 &
 
 script:
-  - ./gradlew connectedAndroidTest
+  - ./gradlew :lib:connectedAndroidTest