Offer a base set of app data

[hartmantis]

So, for example, someone could install Tweetbot without having to find the proper name and pkgutil ID strings.

How should this be exposed to the user? Recipes? Resources? Both?

Maybe Tweetbot can be installed with either:

include_recipe 'mac-app-store::tweetbot'

or:

mac_app_store_app 'tweetbot'

[hartmantis]

Left some examples in the README and going with individual app cookbooks for now--some of these apps also have Windows and/or Linux versions.