Added :run_on_changes_end Guard hook

Author: alexdunae

lib/guard/sass.rb

@@ -139,13 +139,18 @@ def run_with_partials(paths)
     # '_'), calls {#run_with_partials} so that files which include it are
     # rebuilt.
     #
+    # Fires a `:run_on_changes_end` hook with a `changed_files` array and
+    # a `success` bool as parameters.
+    #
     # @param paths [Array<String>]
     # @raise [:task_has_failed]
     def run_on_changes(paths)
       return run_with_partials(paths) if paths.any? {|f| partial?(f) }
 
       changed_files, success = @runner.run(paths)
 
+      hook :end, Array(changed_files), success
+
       throw :task_has_failed unless success
     end