Changes for the 2.0.0 version. Detailed changes are on the 2.0.0 branch.

The library now uses the crpytographically secure API.

more tests plus CLI enhancements

Library no longer supporting ruby 1.9.x

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.

Add Rake tasks to clear limiters

When many integration tests are run in a short period, the local bitpay server
will refuse to create new keys due to the rate limiting function. This
rake task clears the ratelimiters database.