Removed deprecated API method and code warning, updated to Swift 5 (#141

)

* -Removed deprecated API method
-Update to Swift 5 version
-Removed many code warnings

Merge pull request #85 from zhxnlai/swift3

Swift 3 into master

seperate internal classes into their own files too

fix framework directory contents

update podspec

update podspec

update podspec

update pod spec

adding podspec