This used to conflict with the util crate from the standard library, which
has long since been removed.
The import in layout has not been changed because of a conflict with the
util mod there.
Added parse_chunk method declaration to parser
Removed unnecessary visibilty for parse_chunk function
Implemented parse_chunk function
Implemented parse_chunk fn for ServoHTMLParser
Moved parser trait to mod.rs and added finish fn
added licence header to mod.rs and other review comments
Fixed trailing space issue
Fixed failed tabular space test