My Swift extensions

Here are my Swift extensions, as well as changes needed to make Lumberjack more Swift-friendly.
That is fine with me.
> On Oct 13, 2014, at 11:35 PM, Ernesto Rivera <notifications@github.com> wrote:
> 
> In Classes/Extensions/SwiftHelpers.swift:
> 
> > @@ -0,0 +1,86 @@
> > +//
> > +//  SwiftHelpers.swift
> Can we call this one CocoaLumberjack.swift?
> 
> —
> Reply to this email directly or view it on GitHub <https://github.com/CocoaLumberjack/CocoaLumberjack/pull/362/files#r18809780>.
>