Implemented only-of-type pseudo selector
Added more selector tests
Added more CSS selector tests
Nesting of :not is not allowed
Forbid nesting of pseudo elements and not selector
Included empty namespaces
Added more CSS selector tests
Allow global unnamed namespace prefix for attribute selector
Added more tests for the CSS selectors
Allow all namespace prefixes for attributes
Refactored Next and Previous to methods
Skipping spaces after escaped unicode chars
Added another test (and deactivated attribute namespace details)