Changes for version 1.19
- Fixed a pasto in the "Support" section.
- Moved repostitory to [GitHub](https://github.com/theory/class-meta/).
- Fixed installation documentation in the READE so that it demonstrates using `Build.PL rather than `Makefile.PL`, as the latter is not included in the distribution.
- MasonX::Interp::WithCallbacks - Mason callback support via Params::CallbackRequest.