Improved the payment_notify method
updated plugin version to 1.3.1
Reorganizing some files, refactoring, adding some additional checks, optimizing lookups.
Merge pull request #2 from kovshenin/patch-1

Reorganizing some files, refactoring...
Fixed standards
Fixed PagSeguro payment return
fixed the pull request with the version 1.3.1
fixed standards
fixed standards and payment return
stoped directly access to payment-pagseguro.php file
updated the plugin version to 1.4.0
added settings link in plugins page
updated the translation
updated the plugin version to 1.5.0
fixed the payment status errors
updated the plugin version to 1.5.1
fixed payment_notify method
updated the plugin version to 1.5.2