Updated .travis.yml to fix an issue with the android build tools

.travis.yml

@@ -3,6 +3,7 @@ script:
 - "./gradlew clean assembleDebug assembleRelease -x lintVitalRelease check"
 android:
   components:
+  - tools
   - build-tools-23.0.2
   - android-23
   - extra-android-m2repository