Update to CocoaPods 1.0

[astralbodies]

Closes #48

Modernize the project to use Frameworks everywhere, fix CocoaLumberjack issues, and use CocoaPods 1.0 (rc2 at the moment).

Testing:

1. Install CocoaPods 1.0.0.rc.2 and install pods in the main project and TracksDemo.
2. Build each project.
3. Run TracksDemo.

[kwonye]

@astralbodies are the cocoalumberjack macro warnings ok?

[astralbodies]

@kwonye I can set the Podfile to ignore them - but yeah I think they're okay for now

[kwonye]

Slightly unrelated, but I can't seem to run tests through Xcode. Can we fix that on this PR please?

Edit: Seems like Travis can't run tests either so maybe it is related to this PR after all

[astralbodies]

@kwonye I think I've solved it. I had to add a Swift file to the main project to force the bundling of a module map. I also tweaked the Podfile to nest the test target into the main target. Feels weird but I get why it had to be done.

[kwonye]

👍 everything works for me locally and travis builds fine so

[astralbodies]

@jleandroperez Can you give the Mac OS X podspec a whirl with 0.1.0 and CocoaPods 1.0 w/Simplenote?

[jleandroperez]

Building great! Simlpenote OSX PR Here