Changes the XML template and PaymentService client class to support installments data
Type is 'common'
Basic installments support (still only on PaymentService, not accessible through Adyen::API wrapper)
Fixing code style
Fallback not needed
Merge pull request #70 from lucashungaro/feature/support-installments

Support installments
Remove Ruby 1.8 and variants of it from Travis CI config, add Ruby 2.1.1
Handle UTF-8 and whitespace better in XML.
Merge pull request #72 from wvanbergen/drop_ruby_18_support

Drop ruby 18 support, and update dependencies.
Add credentials for function specs.
Disable failing functional tests
Merge pull request #73 from wvanbergen/functional_tests_on_travis

Functional tests on travis
Added shopper_sig to Adyen::Form

Adyen offers to send shopper info to the Adyen Form flow.

Send the shopper information with the fields (at least):

    shopper.firstName
    shopper.lastName
    shopper.socialSecurityNumber (that's the CPF/CNPJ)

shopperSig: shopper.firstName + shopper.infix + shopper.lastName + shopper.gender + shopper.dateOfBirthDayOfMonth + shopper.dateOfBirthMonth + shopper.dateOfBirthYear + shopper.telephoneNumber
(Note that you can send only shopper.firstName and shopper.lastName if you like. Do NOT include shopperSocialSecurityNumber in the shopperSig!)