添加了登陆，修改密码，注册三个页面的csrf；

添加了usernameCheck的valuedation检测方法;
urls.py 添加了register，change_password页面。

static/src/js/lib/formValidation/validator/usernameCheck.js

@@ -0,0 +1,44 @@
+/**
+ * usernameCheck validator
+ */
+
+(function(root, factory) {
+
+    "use strict";
+
+    // AMD module is defined
+    if (typeof define === "function" && define.amd) {
+        define("validator/usernameCheck", ["jquery", "base", "csrf"], factory);
+    } else {
+        // planted over the root!
+        factory(root.jQuery, root.FormValidation);
+    }
+
+}(this, function ($, FormValidation, csrfHeader) {
+    FormValidation.I18n = $.extend(true, FormValidation.I18n || {}, {
+        'en_US': {
+            usernameCheck: {
+                'default': 'Please input the same value'
+            }
+        }
+    });
+
+    FormValidation.Validator.usernameCheck = {
+
+        validate: function(validator, $field, options) {
+                    if ($field.val() == '')
+                        return true;
+                    return !$.ajax({
+                    async: false,
+                    beforeSend: csrfHeader,
+                    url: "/api/username_check/",
+                    data: {username: $field.val()},
+                    dataType: "json",
+                    method: "post",
+
+
+            }).responseJSON.data;
+
+        }
+    };
+}));