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
Merge pull request #1 from jaymedavis/master

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