MatchMediaObservable does not auto-register standard breakpoints about flex-layout

[ThomasBurleson]

Currently the work-around requires a manual registration process like this:

   constructor( 
     @Inject(MatchMediaObservable) media$, 
     @Inject(BreakPointRegistry) breakpoints,   // Only injected due to bug #65
     @Inject(MatchMedia) mediaWatcher,          // Only injected due to bug #65
     ) {
       
      // This is a BUG described above
      // We must manually register all the mediaQueries registered in the BreakPointRegistry
      breakpoints.items.forEach( (bp:BreakPoint) => mediaWatcher.observe(bp.mediaQuery) );
     
      this._subscription = media$
        .subscribe((change:MediaChange) => {
          let isMobile = (change.mqAlias == 'xs') || (change.mqAlias == 'sm');          
          this.isOpen = !isMobile;
      });
   }

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