Log Message:
Update to 2.13. From the changelog:

- Added textile command-line tool submitted by Amir Karger.

- Applied a patch submitted by Serap Kadam for issues with parsing
  whitespace around '!' characters.

- Applied a patch submitted by Andy Yacomink for handling mixed-case
  HTML entity names.

- Applied a patch submitted by Andy Yacomink for running some of
  the inline modifier code as a separate method to allow for a
  subclass to override/prevent them.