Feature/meta tag to cancel rendering #4
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### Added
- New Extension that adds a `{% skip_if %}` tag where you can insert any
condition (e.g. checking the Context) and if it evals as True, a
`CancelRendering` exception is raised and caught by the Renderers causing
them to silently just skip rendering that template.
- The `StringRenderer` returns `None`
- The `StoutRenderer` prints out nothing
- The `FileRenderer` doesn't create an output file
- Added unittests for the `{% skip_if %}` tag
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