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Add GetGlobalCooldown() method to OvaleCooldown.

Author	Johnny C. Lam <jlam88@gmail.com>
Author date	2015-01-01 07:25:39
Author local date	2015-01-01 02:25:39 -0500
Committer	Johnny C. Lam <jlam88@gmail.com>
Committer date	2015-01-01 14:22:52
Committer local date	2015-01-01 09:22:52 -0500
Commit	1808a1376651674692fe2d02b72767ef1e1fa4c5
Tree	bc06029fd2de0c3aba436f1eb4c283c73f6b78ea
Parent	8fd5b26ef4beccd60e48cffa4381ffda910d0e80

Add GetGlobalCooldown() method to OvaleCooldown.

GetGlobalCooldown() works like GetSpellCooldown() and returns the start
and duration for the global cooldown.  If the global cooldown is "ready"
then start and duration are both zero.