Previously exp std output was not passing by sys.out/err and thus was not
captured by sacred.
Change the envs to allow for the output to be captured.

The `exp_args` optional argument can be set to a String containing arguments
passed to the experiment.

All the scripts of the experiment will be passed the complete argument list.

The arguments are tokenized before being passed to the scripts.

Zealot now capture env variables for more reproducible experiments.
Only variables whose name is compatible with sacred `assert_is_valid_key` are
captured at this point.

Made some modules

Can now setup a mongo observer via config