Added unit tests for Retext#applyPlugins
Retext now exposes an `applyPlugins` method (fixes #8)
Added a missing semicolon
Added an example to the Retext docs on how to use custom parsers
Removed functionality to pass strings to the Retext constructor
Update dependencies in component.json
Update changelog for 0.1.0-rc.3
0.1.0-rc.3