[payex] simple purcache example
[payex] remove commented out code.
[payex] add one click payment example.
[test] add payex tests path to autoload
[payex] recurring example
update deps.
[payex] check the examples and make them working again.
[payex] use stable versions if libs.
Merge pull request #16 from Payum/payex-integration

[payex] simple purcache example