Adds method to get tokens passed to command.

[Bored0ne]

This resolves -> https://github.com/nategood/commando/issues/79

[NeoVance]

You are adding a function to return the same tokens that the developer has passed as an argument to begin with? I don't think this is a solution to issue #79. I think the issue may be that he does not know how to find out if a specific option/flag/argument was in the tokens or not.