Support AWS_ACCESS_KEY and AWS_SECRET_KEY in euca-*
Add a default config file and certs
Update setup.py
Generate new man pages

It shouldn't be necessary to re-run generate-manpages.sh after every
build, but it's quite useful for generating new ones or for dealing with
changes.

Also note that euca-version's man page is handwritten.  Keep this in
mind when considering simply deleting man/* and generating them all
anew.
Update README, INSTALL, COPYING, etc.