adding new Is* methods that can be used to check log level to ensure log args aren't evaluated in certain conditions

[sjhitchner]

This methods will be useful so that more involved logging can be turned on when the code is in a lower debug state

i.e.
JSON serialized Request and Response objects when in debugging mode, which won't be logged when in production.

if log.IsTrace() { b, _ := json.MarshalIdent(struct), "", " ") log.Trace(string(b)) }

[jcelliott]

Thanks, I like the idea. I'll try to merge it in later today or tomorrow.

[sjhitchner]

cool, glad you like the changes

[jcelliott]

Sorry it took so long to merge this in, I completely forgot about it until just now. Feel free to open issues with any other suggestions.