Handle router change on some specific routes

[MortezaT]

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On some routes I set the page title and meta description related on corresponding data which is available after NavigationEnd event. It would be great if there was a way to postpone Analytics request until data fetch completed.

[timelf123]

see this: https://github.com/angulartics/angulartics2/issues/112#issuecomment-364231019

[MortezaT]

@timelf123 The solution is really nice if all title happend to be set by one method, but in my case each page handles it's own way to extract the title correspond to it's data.

[MortezaT]

For example on page one it uses data of model A and set title like this:

A.username - page one's | sitename

and for page two it uses model B:

B.title | sitename