Log Message:
Update ruby-highline to 1.6.16.

== 1.6.16

* Added the new indention feature (by davispuh).
* Separated auto-completion from the answer type (by davispuh).
* Improved JRuby support (by rsutphin).
* General code clean up (by stomar).
* Made HighLine#say() a little smarter with regard to color escapes
  (by Kenneth Murphy).