fixed gradle version parsing closes #250

Author: AbrarSyed

gradle/wrapper/gradle-wrapper.jar

@@ -1,6 +1,6 @@
-#Sat Jul 25 16:06:56 CDT 2015
+#Mon Feb 16 23:11:05 CST 2015
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-2.5-bin.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-2.6-bin.zip

gradle/wrapper/gradle-wrapper.properties

@@ -75,8 +75,9 @@ public final void apply(Project arg)
         // check for gradle version
         {
             List<String> split = Splitter.on('.').splitToList(project.getGradle().getGradleVersion());
+            
             int major = Integer.parseInt(split.get(0));
-            int minor = Integer.parseInt(split.get(1));
+            int minor = Integer.parseInt(split.get(1).split("-")[0]);
 
             if (major <= 1 || (major == 2 && minor < 3))
                 throw new RuntimeException("ForgeGradle 2.0 requires Gradle 2.3 or above.");