stats handler
updated docs
Merge branch 'master' of github.com:Minds-On-Design-Lab/givingimpact-php

Conflicts:
	MODL/GivingImpact/Model/Campaign.php
	MODL/GivingImpact/Model/Donation.php
	MODL/GivingImpact/Model/Opportunity.php
	MODL/GivingImpact/Model/Stats.php