[author] Update Spritely to version 0.6.8

Adding this as a member of Artlogic Media (https://github.com/artlogicmedia)
the author(s) of the plugin.

This version was retrieved from the 0.6.8 release:
https://github.com/artlogicmedia/spritely/tree/v0.6.8
Merge pull request #2341 from petronius/master

[author] Update Spritely to version 0.6.8