updating to gradle 3.1 (#2227)

this will enable use of composite gradle builds which should reduce development pain

build.gradle

@@ -285,7 +285,7 @@ test {
 }
 
 task wrapper(type: Wrapper) {
-    gradleVersion = '3.0'
+    gradleVersion = '3.1'
 }
 
 tasks.withType(ShadowJar) {

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Tue Aug 16 16:23:40 EDT 2016
+#Fri Oct 21 15:15:03 EDT 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-3.0-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-3.1-bin.zip

gradlew

@@ -161,4 +161,9 @@ function splitJvmOpts() {
 eval splitJvmOpts $DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS
 JVM_OPTS[${#JVM_OPTS[*]}]="-Dorg.gradle.appname=$APP_BASE_NAME"
 
+# by default we should be in the correct project dir, but when run from Finder on Mac, the cwd is wrong
+if [[ "$(uname)" == "Darwin" ]] && [[ "$HOME" == "$PWD" ]]; then
+  cd "$(dirname "$0")"
+fi
+
 exec "$JAVACMD" "${JVM_OPTS[@]}" -classpath "$CLASSPATH" org.gradle.wrapper.GradleWrapperMain "$@"