Added do_nothing function. Using parse_word to complete the parsing for a token in case of compare_to_reference will fail.
Added method to push back a nullterminated string.
Replaced compare_case_insensitive by a more generic but slower kind.
Simplified compare_to_reference. Improved usage.
Fixed crash when parsing content type.
Implemented content type parsing.
Added unit test to test content type parsing.
Added trie parser.