Fix swift argument parser (#215)

* Resolved dependency on SwiftArgumentParser

- Moved BlueSocketTestClient and BlueSocketTestServer to Examples folder
  with it's own Package.swift file

* Update minimum swift argument parser to 1.1.3

* Update podspec; Update travis build platforms.

BlueSocket.podspec

@@ -1,6 +1,6 @@
 Pod::Spec.new do |s|
   s.name        = "BlueSocket"
-  s.version     = "2.0.2"
+  s.version     = "2.0.3"
   s.summary     = "Socket framework for Swift using the Swift Package Manager"
   s.homepage    = "https://github.com/Kitura/BlueSocket"
   s.license     = { :type => "Apache License, Version 2.0" }