Merge pull request #274 from msherry/master

Return results of postal code check and security code check on cards
first attempt at customers resource
bust the cache?
Update customers.rst
Update customers.rst
Update customers.rst
grammar
remove
(first|last)_name -> name, facebook|twitter ids, ssn_last_4 -> ssn_last4
updated address to be key/value
better examples, email address is not unique
add dob format into docs
udpated with address spec
phone_number -> phone, email_address -> email
phone_number -> phone, email_address -> email
correct the default
facebook|twitter_id remove id, sanitize ssn_last4
fix bug with meta
boom pow DELETE
describe when DELETE is valid