added missing apikey parameter to the balance service (thanks @tomgallard), closes #180
added statement_description to plan entity, create/update objects. closes #181
bumped version
removed double oauth entity values, closes #189, closes #185. hopefully closes other weirdness of properties not showing up - closes #190, closes #188
renamed type to brand to support the 2014.06.13 update
updated lots of entities to match the current stripe documentation
bumped api supported version
updated readme for deleting customers, closes #200
added receipt_email and statement_description to StripeCharge, closes #199
added metadata to StripeInvoice, closes #194
bumping version to 2.3.0
small readme tweak