try to remove --no-skin, because espresso sometimes stops

travis-ci/travis-ci#6340 (comment)

Author: akirasosa

.travis.yml

@@ -21,7 +21,7 @@ before_script:
   - cp gradle.properties.ci.example gradle.properties
   # Emulator Management: Create, Start and Wait
   - echo no | android create avd --force -n test -t android-22 --abi armeabi-v7a
-  - emulator -avd test -no-skin -no-audio -no-window &
+  - emulator -avd test -no-audio -no-window &
   - android-wait-for-emulator
   - adb shell input keyevent 82 &