doc: rtfd Mock class hack

this makes autodoc of urwid decendants work again.
cheers to teythoon

closes #496
Merge branch 'testing' of github.com:pazz/alot into testing
Merge branch '0.3.2-feature-unlink-tempfile-489'
Merge branch '0.3.2-feature-bclosebang-453'
cleanup: split widgets.py and pep8/pyflakes fixes
cleanup: move SettingsManager to its own file
cleanup: move DBManager to its own file
cleanup: make Thread and Message available in alot.db
doc: update api docs wrt moved parts
doc: rtfd Mock class hack

this makes autodoc of urwid decendants work again.
cheers to teythoon

closes #496
Merge branch 'cleanup' into testing
Merge branch 'cleanup'
docs: update some links
Merge branch 'docs' into testing
prevent accidental double sendout

closes issue #497
SendCommand: add some inline docs
Merge branch '0.3.2-feature-avoid-dbl-send-497' into testing
more precise error handling for config parsing
theming: properly transfer alignment to threadline-foo parts

cf issue #494
theming: fix c&p error in mailcount part of ThreadlineWidget