Fix Gemfile Ruby version check for recent RVMs(?)

Said 'ruby-1.9.3ifon_heroku? is not installed.'
Add 'rake db:setup' to README dev setup.
Seed data.
Only create example seed data in dev.
More info about dev data.
Make revisions scale down in size if necessary.
Document parameters.
JS cleanup
More JS cleanup.
De-emphasize your own commits with ?me=Name
Tweak de-emphasize styling
Indicate which revision was clicked last.
Comment about keeping Ruby view and JS in sync.
Add .by-me/.last-clicked to .revision-wrapper.

Since that one is not replaced when the socket receives updates, e.g. a state change.
Cleanup.
open_in_same_page cleanup

Make it do the least destructive thing (opening in a new window) by default, since sometimes the JS is slow to apply.