Locales as first class citizen.

[squeedee]

Locale support needs to be bumped up to a first class set of options. Locale files are a "source" and as such, the 'has source changed' needs to detect changes to the locale files.

[devboy]

We can either attach this logic directly into the compile tasks, but it would probably be smarter to create a locales task and make it a dependency of the compile task: task :compile => :locales.
Let's start a feature branch for this!