Document required ec2 settings

[dimaqq]

Took me a while to get started with bees (from zero ec2 xp!)

Please add these to the docs:

1. default ec2 security group is "default", readme uses "public" in examples
2. default ec2 security group doesn't have inbound ssh enabled, bees are hippies (err msg?)

Minor doc blips:

1. other zones (e.g. eu west) don't work, -z argument is not enough, looks like boto needs to be passed an ec2/rest frontend server name
2. assumptions made by default image (username, versions etc?)

I also had to patch paramiko like this:
https://github.com/sugarc0de/fabric/commit/ec39e90f5ffaaf5d2dd6a653f5f6ddef30a6b150

[dimaqq]

P.S. Thanks for the great tool!

[dimaqq]

actually linked paramiko patch is wrong, atfork() should be called in the beginning of run() instead.

[onyxfish]

Updated docs. The paramiko patch is no longer necessary as of 1.7.7.1. I'll open a new ticket regarding alternate zones: #19.