nuspec adjusted to have version automatically put in by build
lots of build improvements centered around Nuget package creation and deployment
added comments to GoogleSigned class to indicate usage.
Automatically add client=gme-xxx when signing
Google Maps for Business geocoding test

- Recategorise live tests:
  - Now in the "External integrations" category
  - They must be run explicitly
Added request signing example and removed "coming soon".
added information about Google Business API signing
Merge branch 'master' of https://github.com/ericnewton76/gmaps-api-net
Merge branch 'request-signing' of https://github.com/richardthombs/gmaps-api-net into richardthombs-request-signing

Conflicts:
	README.md
	src/Google.Maps/GoogleSigned.cs
removed reference to file not checked in that was causing build problems