Added Matthew Pickering to list of authors.

Updated tests for new \tilde behavior.

Version bump to 0.6.6.2 and update changelog.

Version bump to 0.6.6.1.

Changed data-files to extra-source-files.

Version bump to 0.6.5.1

Added Text.TeXMath.Pandoc module.

This factors out some of the code formerly in
Text.Pandoc.Readers.TeXMath.

Version bump to 0.6.4.

Version bump to 0.6.3

Version bump to 0.6.1.5.

Version bump to 0.6.1.4