gmarty/grunt-closure-compiler — pull request #27 by vvo (2013-05-17 13:57:50+00:00)
Title: When asking for a closure path, we expect .jar

Because you don't know how is the .jar installed on the system.

It could be a git clone but in most cases, it will be the .zip google
gives: https://developers.google.com/closure/compiler/ (Download the
application = zip).

Forcing the user to follow a directory structure is not needed.