Mage: Allow for Frostfire Bolt to replace Fireball for fire mages.

Various conditions checked for whether a Fireball spell was in flight.
Allow those conditions to be satisfied by an in-flight Frostfire Bolt
because those two spells have the same effect for a fire mage, especially
if using Glyph of Frostfire Bolt while soloing.
Mage: Fix improper function call in fire script.
Monk: Dampen Harm is a cooldown spell.
Rogue: Fix buff ID for Instant Poison applied by combat rogues.

Fixes ticket 486 by @alcje.
Update default scripts to SimulationCraft git master from 2014-12-08.
Update README with information about updates and balance druids.