Renamed AttributeNameValueCollection to StyleCollection.
Refactored code.
Added tests for StyleCollection.
Fixed bad xml documentation.
Added overload for Rel.
Added overload for Dir.
Added support for the Html attributes href, alt and shape.
Added support for the Html attributes crossorigin, height, ismap, src, usemap and width.
Added support for replacing '_' with a '-' for the enum extension ToLowerString.
Cahnged Rel method to allow string parameter.
Updated version to 2.1.0