fix some categories
updated styleguide for category fixes
Commands for log drains.
show addons instead of URLs for those drains
add log-drain-info command, update styleguide
Put commands in `hk help more` if they go there.

These commands were listed in main.go as belonging in `hk help more`,
but they didn't actually have the bit that puts them there instead of in
the main help list. Fixes #62.
add runCommand to abstract path-finding part of running a command
pg-psql command