Merge pull request #103 from csmith/master

Update gradle

build.gradle

 
 task createWrapper(type: Wrapper) {
     description 'Downloads and installs an up-to-date wrapper for gradle.'
-    gradleVersion = '2.11'
+    gradleVersion = '2.13'
 }
 

gradle/wrapper/gradle-wrapper.properties

-#Fri Mar 11 23:19:04 GMT 2016
+#Thu May 05 16:44:00 BST 2016
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME