Swiftpm support

[maniramezan]

Fix the issue with SwiftPM setup and add auto generated files to .gitignore

[bryan1anderson]

@maniramezan This fails at return Bundle(path: NSString(string: assetPath).appendingPathComponent("DateTools.bundle"))!
Force unwrap a nil optional. Are bundles allowed in SwiftPM at the moment? I didn't think resource files were allowed

[maniramezan]

@bryan1anderson Yeah, so far it's not possible to add bundles to SwiftPM, package manager resources seems to be a proposal for it. For now, it requires to add them manually.

[MatthewYork]

Alright, I have returned. Quit my job, started a business, and had a child....

But definitely ready to merge in SwiftPM support! Please see the recent Swift 5 release and re-evaluate the pull request just to make sure none of my changes bothered yours.

Really appreciate it!

[MatthewYork]

I'm going to close this request. Please reopen branching off the new release and I will merge. Thanks!

[maniramezan]

@MatthewYork Congrats! 🍾🎉

I opened a PR regarding adding SwiftPM #291 based on latest master.