Check if Mockingjay include Mockingjay-Swift.h ! #106

@kylef
For pod files that do not use use_frameworks!, testing with Mockingjay returns a build error!

<Mockingjay/Mockingjay-Swift.h> file not found

So it will be better for you to add something like this in your MockingjayURLConfiguration.m
to check if include /Mockingjay-Swift.h or not.

this will make life easier for developers who use your pod to unit test their frameworks.
I tried to make a ullRequest on it, but it's not possible for me like I don't have the rights

#if __has_include("Mockingjay-Swift.h")
    #import "Mockingjay-Swift.h"
#else
    #import <Mockingjay-Swift.h/Mockingjay-Swift.h>
#endif