Merge pull request #8 from jollyrojer/all-splitted

Use EC2 ami in the us-east zone
Revert "Use EC2 ami in the us-east zone"
Merge pull request #10 from qubell-bazaar/revert-8-all-splitted

Revert "Use EC2 ami in the us-east zone"
clean ami
Set correct URL to cookbooks, added retry parameter to some chef steps