Replace NeedToRegisterDialog /w SetMxIdDialog

This uses MatrixChat's `view_set_mxid`

src/components/views/dialogs/ChatInviteDialog.js

@@ -284,11 +284,7 @@ module.exports = React.createClass({
 
     _startChat: function(addrs) {
         if (MatrixClientPeg.get().isGuest()) {
-            var NeedToRegisterDialog = sdk.getComponent("dialogs.NeedToRegisterDialog");
-            Modal.createDialog(NeedToRegisterDialog, {
-                title: "Please Register",
-                description: "Guest users can't invite users. Please register."
-            });
+            dis.dispatch({action: 'view_set_mxid'});
             return;
         }
 

src/components/views/dialogs/NeedToRegisterDialog.js

@@ -1,78 +0,0 @@
-/*
-Copyright 2016 OpenMarket Ltd
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-    http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-*/
-
-/*
- * Usage:
- * Modal.createDialog(NeedToRegisterDialog, {
- *   title: "some text", (default: "Registration required")
- *   description: "some more text",
- *   onFinished: someFunction,
- * });
- */
-
-import React from 'react';
-import dis from '../../../dispatcher';
-import sdk from '../../../index';
-
-module.exports = React.createClass({
-    displayName: 'NeedToRegisterDialog',
-    propTypes: {
-        title: React.PropTypes.string,
-        description: React.PropTypes.oneOfType([
-            React.PropTypes.element,
-            React.PropTypes.string,
-        ]),
-        onFinished: React.PropTypes.func.isRequired,
-    },
-
-    getDefaultProps: function() {
-        return {
-            title: "Registration required",
-            description: "A registered account is required for this action",
-        };
-    },
-
-    onRegisterClicked: function() {
-        dis.dispatch({
-            action: "start_upgrade_registration",
-        });
-        if (this.props.onFinished) {
-            this.props.onFinished();
-        }
-    },
-
-    render: function() {
-        const BaseDialog = sdk.getComponent('views.dialogs.BaseDialog');
-        return (
-            <BaseDialog className="mx_NeedToRegisterDialog"
-                onFinished={this.props.onFinished}
-                title={this.props.title}
-            >
-                <div className="mx_Dialog_content">
-                    {this.props.description}
-                </div>
-                <div className="mx_Dialog_buttons">
-                    <button className="mx_Dialog_primary" onClick={this.props.onFinished} autoFocus={true}>
-                        Cancel
-                    </button>
-                    <button onClick={this.onRegisterClicked}>
-                        Register
-                    </button>
-                </div>
-            </BaseDialog>
-        );
-    },
-});