Allow all available query parameters on maps sdk

[jmcarp]

It would be useful if users could specify all relevant query parameters on the sdk download link, so that it's possible to create URLs like e.g. https://maps.googleapis.com/maps/api/js?v=3.2.2&libraries=geometry,places.

[sebholstein]

@jmcarp makes 100% sense, I plan this for 0.7.0. Feel free to send a PR if you have time. Thanks

[IAMtheIAM]

Pardon my ignorance, but how do we implement this method LazyMapsAPILoader to call the libraries we want? The documentation doesn't give any tips or examples yet.

Edit: I figured it out. it goes on the module that imports it.

imports [
AgmCoreModule.forRoot({
         apiKey: 'your_Key',
          libraries: ['drawing', 'places']
      })]