Shaman: Only suggest PE's channel if the player buff isn't present.
Druid: Re-add Faerie Fire to the Guardian rotation.

Faerie Fire would normally have a higher priority than Thrash at certain
times, but in MoP 5.1 it resets the melee swing timer, so only cast Faerie
Fire when everything else is on cooldown.
Druid: Update to action list from SimC:sc_druid.cpp (r15532).