Update version constraint
Solved an error if the response only contains one value

Easypay response ref field is not a multidimensional array if only one record is returned.
Changed array format to the old 5.3
Solved an error if the response only contains one value
Merge pull request #4 from iamfreee/master

Solved an error if the response only contains one value
Add code coverage to test run
Add code coverage
Send code coverage information from travis
Fix travis config
Support for recurring payments