title: Cannot create property 'route' on number '1'
body: <p>With RestAPI, I'm trying to remove one record from my database through these simple code.</p>
  
  <pre><code>import { Component } from '@angular/core';
  import { RestangularModule, Restangular } from 'ngx-restangular'; 
  import { HomePage } from '../pages/home/home';
  @Component({
    templateUrl: 'app.html'
  })
  export class MyApp {
    rootPage:any = HomePage;
    constructor(private restangular: Restangular) {
        this.restangular.one('v1/my_products', '5b3621ce1dbaba5598cdbe08')
        .get()
        .subscribe((res: any) =&gt; {
            res.data.remove();
        })
    }
  }
  </code></pre>
  
  <p>The weird, the document has been successfully removed, but I always get this following error and my app is down</p>
  
  <pre><code>    &gt; ERROR TypeError: Cannot create property 'route' on number '1'
      at restangularizeBase (ngx-restangular.js:54)
      at restangularizeElem (ngx-restangular.js:184)
  at SafeSubscriber.okCallback [as _next] (ngx-restangular.js:360)
      at SafeSubscriber.__tryOrUnsub (Subscriber.js:238)
      at SafeSubscriber.next (Subscriber.js:185)
      at Subscriber._next (Subscriber.js:125)
      at Subscriber.next (Subscriber.js:89)
      at CatchSubscriber.Subscriber._next (Subscriber.js:125)
      at CatchSubscriber.Subscriber.next (Subscriber.js:89)
      at MapSubscriber._next (map.js:83)
  </code></pre>
  
  <p>Package.json</p>
  
  <pre><code>{
    "dependencies": {
      "@angular/animations": "5.0.1",
      "@angular/common": "5.0.1",
      "@angular/compiler": "5.0.1",
      "@angular/compiler-cli": "5.0.1",
      "@angular/core": "5.0.1",
      "@angular/forms": "5.0.1",
      "@angular/http": "5.0.1",
      "@angular/platform-browser": "5.0.1",
      "@angular/platform-browser-dynamic": "5.0.1",
      "@ionic-native/core": "4.8.0",
      "@ionic-native/splash-screen": "4.8.0",
      "@ionic-native/status-bar": "4.8.0",
      "@ionic/storage": "2.1.3",
      "core-js": "^2.5.7",
      "ionic-angular": "3.9.2",
      "ionicons": "3.0.0",
      "ngx-restangular": "2.0.1",
      "rxjs": "5.4.3",
      "sw-toolbox": "3.6.0",
      "zone.js": "0.8.26"
    },
    "devDependencies": {
      "@ionic/app-scripts": "3.1.10",
      "typescript": "~2.6.2"
    }
  }
  </code></pre>
  
  <p>Same case with ngx-restangular@1.0.13 - 3.0.0</p>
  
  <p>what's wrong?</p>