Fix Travis CI failing

Author: bryant1410

.travis.yml

@@ -1,4 +1,4 @@
-nguage: android
+language: android
 jdk: oraclejdk7
 # turn off caching to avoid caching problems
 cache: false
@@ -10,15 +10,15 @@ env:
 
 # Emulator Management: Create, Start and Wait
 before_script:
-  - echo no | android create avd --force -n test -t android-23 --abi armeabi-v7a
+  - echo no | android create avd --force -n test -t android-21 --abi armeabi-v7a
   - emulator -avd test -no-skin -no-audio -no-window &
   - android-wait-for-emulator
   - adb shell input keyevent 82 &
 
 android:
   components:
     - build-tools-23.0.2
-    - android-23
+    - android-21
     - extra
-    - sys-img-armeabi-v7a-android-23
+    - sys-img-armeabi-v7a-android-21