Add XmlSchemaClassGenerator
Download and generate classes for all APIs
Add Search resource
Add link and video stream attachment methods
Make Publish resource use PublishChannel (fixes #5)
Use XmlSchemaClassGenerator from NuGet
Move ImportExport resources into subfolder
Add search tests
Add XML comments to search classes
Add OAuth authentication
Update README.md
Merge remote-tracking branch 'remotes/origin/mganss-test' into develop

Conflicts:
	IS24RestApi.Tests/AttachmentTests.cs
	IS24RestApi.Tests/IS24RestApi.Tests.csproj
	IS24RestApi.Tests/RealEstateTests.cs
	IS24RestApi.Tests/packages.config
	IS24RestApi/AttachmentResource.cs
	IS24RestApi/IPublishResource.cs
	IS24RestApi/IS24Connection.cs
	IS24RestApi/IS24RestApi.csproj
	IS24RestApi/ImportExport/ContactResource.cs
	IS24RestApi/ImportExport/IAttachmentResource.cs
	IS24RestApi/ImportExport/PublishChannelResource.cs
	IS24RestApi/ImportExport/RealEstateResource.cs
	IS24RestApi/PublishResource.cs
	IS24RestApi/Types.generated.cs
	IS24RestApi/packages.config
	IS24RestApi/xsd/common/common-1.0.xsd
	SampleConsole/Program.cs
	SampleConsole/SampleConsole.csproj
	SampleConsole/packages.config