Enabled the assignment of the variable env via config files

Merged Tiago de Freitas Pereira requested to merge add-env-via-config into master

This feature is just an extension of an existent feature. Today the only way to send environment variables to SGE via bob.bio.base is setting the optional argument --environment. This MR allows us to set that via configuration files by adding env=MY_VAR=VALUE.

Before any complains, I can't come up with test case for that one. This is injected directly in the Namespace object (argparse) AND this object is not visible when we I call verify.main().

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