Add UTCDateTime column class, for PR #54
Refactor into a single python distribution

There's no sense distributing relengapi-docs separately from relengapi.

Most of this just moves ./docs/* to ./base/*.  The rest fixes up
the lint options and tests so that validation still passes.

We'll keep the base/ subdirectory for a while, to allow other relengapi
tools to "incubate" in this repository while it's still in flux.
Eventually all of this will move to the top level.

Fixes #59.
Fix pylint issues and pep8, plus review comments
Add missed pytz to requirements.
Merge issue-54 (PR #54)
support a 'condition' callable for root widgets
add a 'can' method to actions
add a root widget for token auth

This only appears for users who have some permission to edit tokens.
Fixes #62.
Merge djmitche/build-relengapi:issue62 (PR #62)