Update ruby-tw to 0.5.2.

(Note newer tw-1.0.2 has been released already, but it requires
 recent tw-twitter 5.x.y which requires much more gems not in pkgsrc)

Changes from History.txt:

=== 0.5.2 2013-09-19

* do not show dialogue with "--yes" option
Updated net/ruby-tw to 0.5.2
Update onscripter to 20131103.

Upstream Changes (only Japanese log available)

20131103:
 - misc iOS 7 improvements
 - implemente savedir instruction
   (existing save date directory might be changed)

20131102:
 - support Xcode 5.0 and iOS 7
Updated games/onscripter to 20131103