v0.6.0
- Add ability to find order by external order identifier

v0.5.0
- Add support for Partner Session API; require openssl.

v0.4.0
- Add support for Rate Quoting API; adds support for Partner-level Requests

v0.3.2
- Add session expired error.

v0.3.1
- Class-level options were being deleted rather than fetched, so subsequent calls were not working.

v0.3.0
- Added find and find_all methods to Order.