update setup scripts

.travis.yml

@@ -1,6 +1,6 @@
 before_cache:
     - find $HOME/.sbt -name "*.lock" | xargs rm
-    - find $HOME/.ivy2/ -name "*.lock" | xargs rm
+    - find $HOME/.ivy2 -name "*.lock" | xargs rm
 
 cache:
     directories:

travis-ci/setup.sh

@@ -14,12 +14,16 @@ if [ ! -d "$ANDROID_HOME" ]
     pushd $HOME/.android
     wget -q http://dl.google.com/android/android-sdk_r24.3.4-linux.tgz
     tar xf android-sdk_r24.3.4-linux.tgz
+    popd
 fi
 
 if [ ! -d "$ANDROID_NDK_HOME" ]
+    mkdir -p $ANDROID_NDK_HOME
+    pushd $HOME/.android
     wget -q http://dl.google.com/android/ndk/android-ndk-r10d-linux-${ARCH}.bin
     chmod +x android-ndk-r10d-linux-${ARCH}.bin
     ./android-ndk-r10d-linux-${ARCH}.bin -y &> /dev/null
+    popd
 fi
 
 echo "y" | android update sdk --filter tools,platform-tools,build-tools-23.0.1,android-23,extra-google-m2repository