Add brief documentation comments for Homesick and Homesick::Actions

lib/homesick.rb

@@ -1,6 +1,7 @@
 # -*- encoding : utf-8 -*-
 require 'thor'
 
+# Homesick's command line interface (with some helper methods)
 class Homesick < Thor
   autoload :Shell, 'homesick/shell'
   autoload :Actions, 'homesick/actions'

lib/homesick/actions.rb

@@ -1,5 +1,6 @@
 # -*- encoding : utf-8 -*-
 class Homesick
+  # Git-related and file-related helper methods for the Homesick class
   module Actions
     # TODO: move this to be more like thor's template, empty_directory, etc
     def git_clone(repo, config = {})