add sinatra resource

[josephholsten]

extremely similar to rails resource, notably doesn't require database.yml

[johnbellone]

@josephholsten Is this working? I'm very interested in being able to use this! @poise

[josephholsten]

@johnbellone yes, I'm using it with https://github.com/jssjr/chef-descartes since that uses a crazy custom application_ruby

[coderanger]

I think this should get moved to its own cookbook for now, until the new application core takes shape.