Adds Hooks API

Adds Parse.Hooks.js in src/cloud-code/Parse.Hooks.js
Moves Cloud code related functions in src/cloud-code

src/cloud-code/Parse.Cloud.js

@@ -0,0 +1,51 @@
+var Parse = require("parse/node");
+var triggers = require("../triggers");
+
+function validateClassNameForTriggers(className) {
+  const restrictedClassNames = [ '_Session' ];
+  if (restrictedClassNames.indexOf(className) != -1) {
+    throw `Triggers are not supported for ${className} class.`;
+  }
+  return className;
+}
+
+function getClassName(parseClass) {
+  if (parseClass && parseClass.className) {
+    return validateClassNameForTriggers(parseClass.className);
+  }
+  return validateClassNameForTriggers(parseClass);
+}
+
+var ParseCloud = {};
+ParseCloud.define = function(functionName, handler, validationHandler) {
+  triggers.addFunction(functionName, handler, validationHandler, Parse.applicationId);
+};
+
+ParseCloud.beforeSave = function(parseClass, handler) {
+  var className = getClassName(parseClass);
+  triggers.addTrigger('beforeSave', className, handler, Parse.applicationId);
+};
+
+ParseCloud.beforeDelete = function(parseClass, handler) {
+  var className = getClassName(parseClass);
+  triggers.addTrigger('beforeDelete', className, handler, Parse.applicationId);
+};
+
+ParseCloud.afterSave = function(parseClass, handler) {
+  var className = getClassName(parseClass);
+  triggers.addTrigger('afterSave', className, handler, Parse.applicationId);
+};
+
+ParseCloud.afterDelete = function(parseClass, handler) {
+  var className = getClassName(parseClass);
+  triggers.addTrigger('afterDelete', className, handler, Parse.applicationId);
+};
+  
+ParseCloud._removeHook = function(category, name, type, applicationId) {
+  applicationId = applicationId || Parse.applicationId;
+  triggers._unregister(applicationId, category, name, type);
+};
+
+ParseCloud.httpRequest = require("./httpRequest");
+
+module.exports = ParseCloud;