Use NS_ENUM and NS_OPTIONS for the log level and log flags

You can just pick fd9d3ed if you only want the enums/options.
This change does make CocoaLumberjack more Swift-friendly, but more work will be needed to make it viable.
New frameworks made in Xcode 6 and later have that defined already.

Sent from my iPhone

> On Sep 28, 2014, at 7:33 PM, Ernesto Rivera <notifications@github.com> wrote:
> 
> In Classes/CocoaLumberjack.h:
> 
> > @@ -57,6 +57,14 @@
> >   * This means you can pass it multiple variables just like NSLog.
> >   **/
> >  
> > +#import <Foundation/Foundation.h>
> > +
> > +//! Project version number for CocoaLumberjack.
> > +FOUNDATION_EXPORT double CocoaLumberjackVersionNumber;
> > +
> > +//! Project version string for CocoaLumberjack.
> > +FOUNDATION_EXPORT const unsigned char CocoaLumberjackVersionString[];
> I think those are already handled by either:
> 
> CocoaPods' Pods-environment.h:
> #define COCOAPODS_POD_AVAILABLE_CocoaLumberjack
> #define COCOAPODS_VERSION_MAJOR_CocoaLumberjack 2
> #define COCOAPODS_VERSION_MINOR_CocoaLumberjack 0
> #define COCOAPODS_VERSION_PATCH_CocoaLumberjack 0
> Framework/static libraries' Info.plist (seems outdated right now).
> —
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