Fix gradle clean task

Author: rdegnan

rsocket-rpc-core/build.gradle

@@ -2,7 +2,7 @@ import static org.apache.tools.ant.taskdefs.condition.Os.*
 
 plugins {
     id 'io.spring.dependency-management' version '1.0.6.RELEASE'
-    id 'com.google.protobuf' version '0.8.5'
+    id 'com.google.protobuf' version '0.8.6'
 }
 
 description = 'RSocket RPC Library'
@@ -128,4 +128,8 @@ protobuf {
             }
         }
     }
-}
+}
+
+clean {
+    delete protobuf.generatedFilesBaseDir
+}

rsocket-rpc-metrics-idl/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'com.google.protobuf' version '0.8.5'
+    id 'com.google.protobuf' version '0.8.6'
 }
 
 description = 'RSocket RPC Metrics IDL'

rsocket-rpc-protobuf-idl/build.gradle

@@ -1,5 +1,5 @@
 plugins {
-    id 'com.google.protobuf' version '0.8.5'
+    id 'com.google.protobuf' version '0.8.6'
 }
 
 description = 'RSocket RPC Protobf IDL'

rsocket-rpc-protobuf/build.gradle

@@ -1,6 +1,5 @@
 plugins {
   id 'cpp'
-  id 'com.google.protobuf' version '0.8.5'
 }
 
 description = 'RSocket RPC Protobuf Generator'
@@ -13,29 +12,6 @@ def pathToPlugin = "${artifactStagingPath.getPath()}/${pluginName}"
 sourceCompatibility = 1.8
 targetCompatibility = 1.8
 
-protobuf {
-  generatedFilesBaseDir = "${projectDir}/src/generated"
-
-  protoc {
-	artifact = "com.google.protobuf:protoc"
-  }
-  plugins {
-	rsocketRpc {
-	  path = pathToPlugin
-	}
-  }
-  generateProtoTasks {
-	all().each { task ->
-	  task.dependsOn ':rsocket-rpc-protobuf:java_pluginExecutable'
-	  task.inputs.file "$pathToPlugin"
-	  task.inputs.file "${rootProject.projectDir}/build.gradle"
-	  task.plugins {
-		rsocketRpc {}
-	  }
-	}
-  }
-}
-
 // Adds space-delimited arguments from the environment variable env to the
 // argList.
 def addEnvArgs = { env, argList ->
@@ -159,13 +135,6 @@ task buildArtifacts(type: Copy) {
   into artifactStagingPath
 }
 
-compileJava.dependsOn ':rsocket-rpc-protobuf:buildArtifacts'
-compileJava.dependsOn ':rsocket-rpc-protobuf:generateProto'
-
-clean {
-  delete protobuf.generatedFilesBaseDir
-}
-
 artifacts {
   archives("$pathToPlugin" as File) {
 	classifier osdetector.os + "-" + osdetector.arch