fix: fixed incorrect inside element resolution logic

BREAKING CHANGE: previously if `inside` config property was not set (undefined) and viewContainerRef was supplied `inElement` resolved to true, now only if `inside` is explicitly true the modal is considered to be inside an element (i.e: inside the view container)

closes: #163

src/components/angular2-modal/overlay/overlay.service.ts

@@ -73,7 +73,7 @@ export class Overlay {
     }
 
     let dialog = new DialogRef<any>(this, config.context || {});
-    dialog.inElement = config.inside === undefined ? !!vcRef : !!config.inside;
+    dialog.inElement = !!config.inside;
 
     let cmpRef = renderer.render(dialog, vcRef);