Travis CI: Use Android builder

.travis.yml

@@ -1,10 +1,7 @@
-language: java
+language: android
+android:
+  components:
+    - android-8
+install: gradle assemble
+script: gradle check
 
-before_install:
-    - sudo apt-get update -qq
-    - if [ `uname -m` = x86_64 ]; then sudo apt-get install -qq --force-yes libgd2-xpm ia32-libs ia32-libs-multiarch; fi
-    - wget http://dl.google.com/android/android-sdk_r23.0.2-linux.tgz
-    - tar xzf android-*
-    - export ANDROID_HOME=$PWD/android-sdk-linux
-    - export PATH=${PATH}:${ANDROID_HOME}/tools:${ANDROID_HOME}/platform-tools
-    - echo "y" | android update sdk --filter platform-tools,android-8 --no-ui --force