Options for output log.

[distante]

Will be good if we can choose what warnings would we like to see in the output log.

For instance, I use console.log and console.table to check several things and I get always many messages as: WARN: Dropping side-effect-free statement , since I want to check what was deleted this took a lot of time.

[Kurtz1993]

Sorry for the delay about this :S
Verbosity level will be good to add. I'll take a look into this.