To support the pair command, cleaned up and extended client and
key_utils classes with more getters. Also added a param hash to the
invoice creation for extra items.
Updated Readme file
This allows us to easily write a pem file to disk and recreate the key
from the pem file. We were unable to remove the ecdsa gem entirely, the
OpenSSL library does not handle EC signatures.
1.9.x will be deprecated in February of 2015, so there is little
incentive to write our new library to support it. 1.9.x users should
still be able to use V1 of the API.
This commit adds some changes, such as named arguments, that are
incompatible with 1.9.x.
Use the gem version constant instead of the string existing in
multiple places. This will prevent confusion in case the client
version is bumped but the request header gets missed. This could lead
to potential confusion if Bitpay ever needs to debug version of Ruby
client used to access the API.
