2014-03-06: Version 0.3:
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 - added support for anchor links ([#...])
 - added bold and underline text formatting ( *...* and _..._ )
 - added support for replacing special characters
 - added optional header numbering by using file header line "number_headings: yes"
 - added feature to insert a table of content ([toc])
 - added option to remove stale files in output directory (-d option)

2014-02-19: Version 0.2:
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 - first public release
