A more modern lib structure
Move the subdomain_klass.current logic down into middleware
Require utils in test file
Middleware has to render its own 404
Bump version b/c breaking change
handle newrelic middleware proxy wrappers
Merge pull request #9 from consolo/middleware

Move logic to Rack middleware. Bump to verion 4 b/c breaking changes.
Merge branch 'master' into fiber-safe-thread-variables