Great tool - I'm setting up a training workshop around using it to help develop Galaxy tools here at the BCCDC.
Sort of a cosmetic error: When I run "planemo linter" on the demo template project, I get:

Applying linter lint_help... WARNING
.. WARNING: Invalid reStructuredText found in help - [[Errno 2] No such file or directory: '/usr/lib/python2.6/site-packages/planemo_ext/galaxy/util/docutils_template.txt'].
.. CHECK: Tool contains help section.

I see some galaxies (branches?) out there hava a docutils_template.txt file that simply contains "%(body)s". Is that related to this?
Regards,
Damion