Fixes #1, move tags to .foodcritic

Instead of using tags in the Rakefile, put them in the .foodcritic
config file so it's easier to find and reason about.
Move nginx service to end of recipe

Service resources generally should be at the end of recipes when they
have configuration files that can modify their behavior. If a
configuration file is broken, and the service fails to restart, it
will always fail to start before Chef has a chance to configure the
file/template that could fix whatever configuration was broken.
fix compatibility w/ latest serverspec
Merge pull request #2 from opscode-cookbooks/jtimberman/feedback

Some feedback in the form of a pull requests