Update library version number to reflect earlier 2.0 release.

Merge pull request #19 from Greg-Boggs/api-v2

Api v2

Direct Debit test start date changed from 12 to 13 days in future. Mu…

…st be greater than 12.

Direct Debit test start date changed from 12 to 13 days in future. Mu…

…st be greater than 12.

Updated date string to SOAP specifications, cleaned up documentation.

Removing unsupported IPv6 email addresses from API calls.

Merge pull request #16 from iATSPayments/soap-version-1-2

Moved default SOAP options into apiCall(), switched to SOAP 1.2.