Update docs.
Add install.rst.

Missed in last commit.
v0.9.23
Delete unused tasks.
Update embedded settings.
Consistent and short task names for all!
Show error message when workers are down.
Fix mismatched tag.
Refactor backend so it can be overridden.
Refactor build_stats into its own method.
run_workers: Detect app name.
Foursquare: Need not be staff to link account.
Use request to generate plugin redirect urls.
Don't install setup_wizard urls when disabled.