Doconv

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* Drop support for Python 2.6 and 3.3
* Update release process
* Fix bug preventing doconv to work with latest version of some dependencies

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* Improve confusing error message under certain circumstances when using Python 3.

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* Fixed issue converting notes from AsciiDoc to DITA.
* Added support for Python 3.4 and 3.5.

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* Preparations for native packaging for Ubuntu and Arch Linux.

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* Add asciidoctor plugin.
* Add doconv command to query available document formats.

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* Expand and improve documentation.
* Proper logging (available using --verbose CLI option).
* New plugins are now easier to develop.