release v1.0.0

• kitchen.cloud.yml:
  • Use t1.micro-ebs instances on EC2
  • Use 512MB instances on DigitalOcean
  • require_chef_omnibus true instead of latest
  • Some images updated
• README: fixed some typos (issue #7, thanks Jordi Llonch)
• Added from_package recipe, packages recipe marked for future deprecation (issue #8, thanks Jordi Llonch)
• Added integration tests for IMAP protocol
• Package installation and template generation logic standardized using a Dovecot::Conf#require? method (issue #9, thanks Jordi Llonch for the help)
  • _Note:_ This change is _huge_, but it is supposed to be backwards compatible
• Added Ohai 7 plugins support (issue #10)