PLT-2257 Reorganized System Console (#3003)

* Reorganized system console

* Fixed the names of some components

* Fixed timestamp for BrandImageSetting

* Fixed merge issues

* Updated push notification settings to match master branch

* Removed top level setting pages and moved enable Gitlab/LDAP settings onto their respective pages

* Re-added restrictDirectMessage setting to system console

* Re-added email connection test and fixed some margins

* Fixed ESLint errors

* Renamed Authentication > Onboarding to Authentication > Email in the system console

* Renamed Customization > Whitelabeling to Customization > Custom Branding in System Console

* Re-added EnableOpenServer to system console

webapp/components/admin_console/save_button.jsx

@@ -0,0 +1,61 @@
+// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
+// See License.txt for license information.
+
+import React from 'react';
+
+import {FormattedMessage} from 'react-intl';
+
+export default class SaveButton extends React.Component {
+    static get propTypes() {
+        return {
+            saving: React.PropTypes.bool.isRequired,
+            disabled: React.PropTypes.bool
+        };
+    }
+
+    static get defaultProps() {
+        return {
+            disabled: false
+        };
+    }
+
+    render() {
+        const {saving, disabled, ...props} = this.props; // eslint-disable-line no-use-before-define
+
+        let contents;
+        if (saving) {
+            contents = (
+                <span>
+                    <span className='glyphicon glyphicon-refresh glyphicon-refresh-animate'/>
+                    <FormattedMessage
+                        id='admin.saving'
+                        defaultMessage='Saving Config...'
+                    />
+                </span>
+            );
+        } else {
+            contents = (
+                <FormattedMessage
+                    id='admin.save'
+                    defaultMessage='Save'
+                />
+            );
+        }
+
+        let className = 'save-button btn';
+        if (!disabled) {
+            className += ' btn-primary';
+        }
+
+        return (
+            <button
+                type='submit'
+                className={className}
+                disabled={disabled}
+                {...props}
+            >
+                {contents}
+            </button>
+        );
+    }
+}