0.25
- added callback support.
- improved debug messaging.
- fixed bug in delimiter assignment.
- rearranged distribution files.
- improved test script.

0.24
- added sample script and data.

0.23
- fix pseudo-bug relating to 'o' option and regular expressions and token
matching.

0.22
- add push_delimiters method for adding to the delimiter array.

0.21
- add pre_parse and post_parse methods; add minimal debug message support.

0.20
- added multi-token support

0.17
- delimiters() now returns an array of references to the real and the escaped
delimiters. This differs from previous behavior where an array reference
was returned.

