Adding Rest Api Service Support

Rest Service on plugins
-----------------------

1. enable service

add the following line in plugin __constructor main class
$this->enableRestService(true);

2. Create the sources directory structure by example:
if you plugin is named myPlugin

myPlugin
    |--src
        |--Services
             |--Api
                 |--MyPlugin
                      |--Test.php

Where Test.php is a Restler class

workflow/engine/classes/class.plugin.php

@@ -341,10 +341,10 @@ class PMPlugin
      * @param array/string $pluginJsFile
      * @return void
      */
-    function registerRestService($classname, $path = '')
+    function registerRestService()
     {
         $oPluginRegistry =& PMPluginRegistry::getSingleton();
-        $oPluginRegistry->registerRestService($this->sNamespace, $classname, $path);
+        $oPluginRegistry->registerRestService($this->sNamespace);
     }
 
     /**
@@ -360,6 +360,12 @@ class PMPlugin
         $oPluginRegistry =& PMPluginRegistry::getSingleton();
         $oPluginRegistry->unregisterRestService($this->sNamespace, $classname, $path);
     }
+
+    function enableRestService($enable)
+    {
+        $oPluginRegistry =& PMPluginRegistry::getSingleton();
+        $oPluginRegistry->enableRestService($this->sNamespace, $enable);
+    }
 }
 
 class menuDetail