Update version of INAppStoreWindow to latest (93cb2d2644) from https://github.com/indragiek/INAppStoreWindow

This also fixes issue #1128.

Tested on 10.9.1 (13B42).
Merge pull request #1164 from sutrobear/bugfix_issue1128

Fix issue #1128 "Leaking CGColor objects when calling IN_CGColorCreate i...
Update Stella submodule