Druidic Oath

Gameplay implications
While breaking the oath, druids cannot:
 * cast spells
 * cast offensive SLAs from druid enhancement trees
 * cast Goodberry
 * use Wild Shape (druids who wear a metallic armor while in animal form revert to their humanoid forms)

While breaking the oath, druids can:
 * summon and command their pet
 * use Spring Resurgence
 * use Wild Empathy and Improved Wild Empathy