Revised BeforeRequest/AfterResponse interceptors to use HttpClient.
Changes for Simple.OData.Client rewritten with async/await.
Minor correction.
Fixed Microsoft.Bcl.Async dependencies.
Changes for Simple.OData.Client 2.0.0-rc1.
Merge branch 'httpclient' into develop

Conflicts:
	Simple.Data.OData.Tests/App.config
	Simple.Data.OData.Tests/Simple.Data.OData.Tests.csproj
	Simple.Data.OData/Simple.Data.OData.csproj
	Simple.Data.OData/app.config
	Simple.Data.OData/packages.config
Changes for Simple.OData.Clinet v 2.0.0-rc2.
Changes for Simple.OData.Client 2.0.0-rc3.
Changes for Simple.OData.Client 2.0.0-rc5
Released version 1.1.0 (references Simple.OData.Client 2.0.0).
Update Nuspec.
Merge branch 'develop'