Remove absolute link from docs

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Add canonical link pointing at fig.sh

This will keep Google happy.

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Update URL in readme and setup.py

Signed-off-by: Ben Firshman <ben@firshman.co.uk>
Merge pull request #330 from orchardup/www.fig.sh

www.fig.sh