Added environment (sandbox and production) support in the constructor
Revert "Added environment (sandbox and production) support in the constructor"

This reverts commit 9e9e9dea6401f03c66e03ad28653aa1b38468db8.
Added environment (sandbox and production) support in the constructor
Merge pull request #33 from NicolasMassart/master

Add ability to define sandbox or production environment at class construction