Service provider application

Also adds a skeleton build system, including mostly automated version
management.
Correct Automator Action versioning
Version bump to 2.0.0b2
Dynamically generate Platypus template

Platypus templates need to contain absolute paths to work: solved by
marking the template proper intermediate and generating it via Mustache
when needed.
Build system default action

`rake` without task will run `rake test`, then `rake build`.
Packaging task

Generate a zip of all packages for upload to GitHub. Don’t use
PackageTask (for better zip result control).