This is needed for distributions (Debian/Ubuntu) which only have a python2 tox.
Tests will still be run with python3, but the setup will be called with
python2.
Closes#12.
See #499.
See #11.
This adds PyYAML as a new dependency.
It adds the following new commands:
:session-delete <name>
Delete a session.
:session-load <name>
Load a session.
:session-save [<name>]
Save a session.
:wq [<name>]
Save open pages and quit.
And the following new settings:
general -> save-session:
Whether to always save the open pages.
Our home-brewn enum wasn't really liked by pylint (many no-member errors), so
instead of adding some workaround, we just use the python 3.4 enum instead.
This however also means we need to depend on Python 3.4 and not 3.3. Maybe we
should use enum34 on Python < 3.3.
