Pycco

This release includes some code modernization and greater test coverage, plus:

- one new feature, courtesy of vrde: `--skip-bad-files`, also now aliased to `--ignore-errors`, does what it says on the tin: Pycco will continue operation if it encounters a file it does not understand.
- three Markdown enhancements are available: smartypants (which, contrary to the documentation, wasn't enabled before), fenced code blocks, and footnotes.

Changes:
- Courtesy of goosemo, Pycco will recurse into directories given as arguments and attempt to process all the contents.
- Added `-s` argument to continue processing a list of files (or directory) if an unprocessable file is encountered.

Generate a simple index of all generated documentation using the `-i` flag. Many thanks to abbgrade for his contribution to Pycco.

- Bugfixes
- Specify language