feat(AgmMarker): auto-convert string to Number for lat/lng (#1424)
feat(AgmMarker): auto-convert string to Number for lat/lng (#1424)

fixes #771 


SebastianM/angular2-google-maps,SebastianM/angular-google-maps,SebastianM/angular2-google-maps,SebastianM/angular-google-maps,SebastianM/angular2-google-maps