Service classes changed to instance methods to support dependency injection down the road.
first stab at working with Google Business licensing for these API calls.
added summary description to DistanceMatrixService and StaticMapService
Merge branch 'master' into v0.11.0

Conflicts:
	src/Google.Maps/DistanceMatrix/DistanceMatrixService.cs
	src/Google.Maps/StaticMaps/StaticMapService.cs
Merge branch 'v0.11.0' into KeySigningUrls
changed Sensor property to nullable to match other request APIs
tests were realigned with code changes
added ElevationServiceTests and a couple of sample outputs
Merge branch 'master' into v0.11.0

Conflicts:
	src/Google.Maps.Test/Elevation/ElevationServiceTests.cs
	src/Google.Maps/DistanceMatrix/DistanceMatrixRequest.cs
	src/Google.Maps/DistanceMatrix/DistanceMatrixService.cs
	src/Google.Maps/Elevation/ElevationRequest.cs
	src/Google.Maps/StaticMaps/StaticMapService.cs
Merge branch 'v0.11.0' into KeySigningUrls
Integrated google signing instance into GetRequest pipeline.