use scala build system

.travis.yml

@@ -1,3 +1,10 @@
+language: scala
+
+sudo: false
+
+scala:
+    - 2.11.7
+
 before_cache:
     - find $HOME/.sbt -name "*.lock" | xargs rm
     - find $HOME/.ivy2 -name "*.lock" | xargs rm

travis-ci/setup.sh

@@ -5,10 +5,6 @@ export ANDROID_NDK_HOME=$HOME/.android/android-ndk-r10d
 export ANDROID_HOME=$HOME/.android/android-sdk-linux
 export PATH=${ANDROID_NDK_HOME}:${ANDROID_HOME}/tools:${ANDROID_HOME}/platform-tools:${PATH}
 
-echo "deb http://dl.bintray.com/sbt/debian /" | sudo tee -a /etc/apt/sources.list.d/sbt.list
-sudo apt-get update
-sudo apt-get install -y ccache sbt
-
 if [ ! -d "$ANDROID_HOME" ]
     mkdir -p $ANDROID_HOME
     pushd $HOME/.android