Fix groupid in build file (remove dupe modid)

Author: robotgryphon

build.gradle

@@ -20,7 +20,7 @@ apply plugin: 'eclipse'
 apply plugin: 'maven-publish'
 
 version = "${mod_version}"
-group = 'com.robotgryphon.compactmachines' // http://maven.apache.org/guides/mini/guide-naming-conventions.html
+group = 'com.robotgryphon' // http://maven.apache.org/guides/mini/guide-naming-conventions.html
 archivesBaseName = mod_id
 
 sourceCompatibility = targetCompatibility = compileJava.sourceCompatibility = compileJava.targetCompatibility = '1.8' // Need this here so eclipse task generates correctly.