ngx-admin does not work with protractor

### Issue type

**I'm submitting a ...**

* [x] bug report
* [ ] feature request
* [ ] question about the decisions made in the repository

### Issue description

**Current behavior:**
Its currently impossible to write stable protractor tests since ngx-admin seems to do some things under the hood that prevent protractor from finding out whether angular has settled or not.

If you run

```
ng e2e
```

on the following fork

https://github.com/rburgst/ngx-admin/commit/d077b2563a10550109081d9e8522d204ebde2367

you will get the following error

```
1) protractor-problem App should display welcome message
- ScriptTimeoutError: Timed out waiting for asynchronous Angular tasks to finish after 11 seconds. This may be because the current page is not an Angular application. Please see the FAQ for more details: https://github.com/angular/protractor/blob/master/docs/timeouts.md#waiting-for-angular
While waiting for element with locator - Locator: By(css selector, .user-name)
```

This happens after a trivial 2 step spec:

```javascript
await browser.get('/');
expect(element(by.css('.user-name')).getText()).toEqual('Nick Jones');
```

My real app is somewhat more involved but I am getting the same kinds of issues.
Since the very same test works fine with a vanilla angular app, I am inclined to believe that ngx-admin or nebular has something to do with it.

**Expected behavior:**
It should be possible to write robust protractor tests that dont timeout while waiting for angular.

**Steps to reproduce:**

Check out the following commit / repo

https://github.com/rburgst/ngx-admin/commit/d077b2563a10550109081d9e8522d204ebde2367

**Related code:**

https://github.com/rburgst/ngx-admin

```javascript
await browser.get('/');
expect(element(by.css('.user-name')).getText()).toEqual('Nick Jones');
```

### Other information:

**npm, node, OS, Browser**
```
Node, npm: `node --version` and `npm --version`
node --version
> v9.5.0
yarn --version
> 1.6.0
OS: macOS (High Sierra)
Browser: Chrome

```

**Angular, Nebular**
```
same as on master: SHA1 bb9dccf
```