Added method to perform raw api request and catch errors.
Errors now returned in response object if they occur.
Tests using latest version of jQuery.

Updated test.html; added test for getting instruments and changing orders.
Added optional parameters to some requests.
Updated README.
modified rates.instruments to return default fields if fields is not set
Updated response.error object to return error fields instead of xhr object.
Added support for optional parameters to order, trade, & transaction GET
Added opt parameters to trade POST.
added requests for accountList and specific account details
Switched back to api-sandbox for default baseURL. Minor formatting fixes.