Update: Fix for Issue #912 ($position in repeat directive can't be both first and last at the same time)

[maxmart]

Same pull request as #928 but it's from a separate branch, so future commits that I do to my master won't affect it. See #928 for more info.

Sorry for the mess.

Fix for issue #912 (#912)

Implementation of my suggested fix where three boolean values $first, $middle and $last replaces the $position variable. I also added a test case for single item lists.

[IgorMinar]

landed as 1d38867

thanks! can we send you a t-shirt? http://goo.gl/D9uOx

[maxmart]

Sweet! Thank you :)