This pull includes new directions for positioning tooltips:
They basically are equivalents for nw,ne etc. but reversed. Here's how it looks live: http://okonski.org/dev/tipsy-test/index.html
PS. This merge also included README changes that I posted in a different pull request, so ignore them.
Converted README to Markdown
Wrap <head> in pre tags
New lines in first section
Added new directions en,es,wn,ws for positioning the tooltip