Logger instance

[yichizhang]

Hi Damien, the library is great, thanks.
I have one suggestion for the last line in Logger.swift:
public let Log = Logger(formatter: .Default, theme: .Default)

First thing is, the name of an instance should not be capitalized? Would public let log = be better?
Also, what do you think about leaving the responsibility of creating a Logger instance to the user, by deleting that line?

[delba]

Hi Yichi, thank you for your interest!

1. The capitalized instance surely isn't conventional but it prefer it over Logger.standardLogger() or log. If the user just uses one logger, I don't want him to think about Log as an instance. Log.trace("hi") will look like a static func and spare him some mental burden.
2. I want to keep a default logger. It's kind of "plug-and-play". In my case, I only use one logger (the Log instance) and I just change its theme with Log.theme = ... to match my editor's one.
   However you can access the Logger class to create your own from scratch (see here).

Thanks again 😃

/cc @yichizhang

[yichizhang]

Cool! Yes it makes more sense to me now. Thanks.

[delba]

@yichizhang Actually you're right 😄

I was used to use it without carthage/cocoapods and I didn't realize the pain of all those import Log at the top of our files...

I just release the v0.3 version and updated the README.

Thanks and sorry about that!