Removed `extract()` from `Deft.util.Function`.

Deft.util.Function is intended for utility methods that pertain to functions (like Ext.util.Function).
Migrated the `extract()` method to a private method of the only Deft JS class that uses it (Deft.mvc.Observer).
Fixed Mac OS X / Unix build path for JSDuck.
Updated docs via JSDuck.

Generating a new baseline to define issues against as we refine the documentation in preparation for 1.0.