Update for Swift 3 compatibility

[regnerjr]

I see reference in the project file to an example project?
Should this be updated too?

Let me know if I can help of clean up anything further.

Hope this helps.

[angelodipaolo]

Thanks for taking the time to update this for Swift 3! It would be great if you could also update the example project.

Since the Swift 3 changes are breaking API changes and will require a major version bump, I'd like to take this opportunity to improve the API and make other breaking changes. Mainly, replacing NetworkStatusInterpreter with an enum. Because of this, I'd like to wait to merge your Swift 3 updates into master until after the API changes are in so I can tag a stable 2.0.0 release. Could you please open a new PR with the new swift3 branch I just pushed up as the base instead of master?

Also, if you have any interest in taking on #4 feel free to make the changes as part of your PR.

[regnerjr]

Thanks for the encouragement @angelodipaolo I'll try to get to these changes over the next few days. I'll open an new pr to the new branch, and look at making the updates outlined in #4.

[angelodipaolo]

@regnerjr no need to worry about making the changes in #4 now that @nonsensery fixed it with a slightly different in approach.

[regnerjr]

Having some trouble getting some of the symbols to export correctly across the swift objc boundary.
Will try again later when I have some more time. Thanks.