Updated author email
Upped version to 2.6.dev

We are ready to start adding/changing features now.
Add YAML support to Meta extension

By default, this only supports YAML deliminators (`---`) and adds no
additional behavior. In other words, parsing is unchanged. However, with
the `yaml` option set, PyYAML will parse the metadata.

Thanks to @kernc for suggesting the idea and doing the work on this.
Merge branch 'kernc-meta_yaml'