Merge pull request #12 from eucalyptus/master

Merge pull request #33 from gregdek/master
Too many changes in one commit, sigh. But in general: improving
explanations, putting the tutorial image in the tutorial bucket,
adding error checking, and so on.
Various improvements
Merge branch 'master' of github.com:gregdek/eucalyptus-cookbook
Point to the tutorial after install is complete.
Cleaning up the TODO list
Merge pull request #34 from gregdek/master

Tutorial improvements