Filter messages from modules

[olanod]

Femme looks quite nice, one feature I'm missing though is to filter out debug messages from some dependencies, I still want to keep the debug level but not log things from hyper for example.

[fiag]

#29 implements a simple filter. Hope it helps.

[lolo32]

It can be obtained with RUST_LOG environment, from the log crate (used internaly by femme)

[IcanDivideBy0]

@lolo32 no it can't
RUST_LOG is used by the env_logger crate, not the log crate so it have no effect