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Separate out rotation functions from the default scripts for reusability.

Author	Johnny C. Lam <jlam88@gmail.com>
Author date	2014-12-28 02:58:28
Author local date	2014-12-27 21:58:28 -0500
Committer	Johnny C. Lam <jlam88@gmail.com>
Committer date	2014-12-28 19:14:36
Committer local date	2014-12-28 14:14:36 -0500
Commit	d3e5eb4a32a386be98f1671ce56755c7233e14e4
Tree	31f477d20c4a039eb7edfbe4ee31edf70eb0433c
Parent	b7c9a536891c4f7d4c2779f52e80d6a0b1602cca

Separate out rotation functions from the default scripts for reusability.

The rotation functions form the model for the script and the icon
defintions form the view for the script.  Split them into separate scripts
so that it's possible to tweak just the icon layout.