Add YamlDotNetEditor extension for Visual Studio.
Highlight tabs present in indentation.
Start implementing the Deserializer.
Implement more of the deserializer.
Update copyright notice.
Update more unit tests.
Migrate more tests to Deserializer.
Merge remote-tracking branch 'origin/Deserializer' into Deserializer

Conflicts:
	YamlDotNet.RepresentationModel/Serialization/Deserializer.cs
	YamlDotNet.UnitTests/RepresentationModel/SerializationTests.cs