Merge pull request #1 from PayU/refactoring

update from upstream
fix mixed line endings
fix some validation issues for coding style in ePayment SDK
make ePayment SDK compliant to the PrestaShop coding style
make ipn.php phpdoc valid
Merge branch 'orderv2' into fixes-for-validator
Merge branch 'fixes-for-validator' into orderv2
remove indentation in one file
replace require_once() with include_once()
include() ePayment files
replace $this->display_name with $this->displayName in payu.php