Implemented the "gmt" static property in the TimeZone+Zone extension.

Sources/Communications/Classes/MockURLProtocol.swift

@@ -17,6 +17,7 @@ public class MockURLProtocol: URLProtocol {
     
     // MARK: Properties
     
+    /// The dictionary in which the mock requests with its respective mock responses will be injected.
     public static var mockData: [MockURLRequest: MockURLResponse] = [:]
     
     // MARK: Functions

Sources/Core/Extensions/TimeZone+Zone.swift

@@ -0,0 +1,10 @@
+import Foundation
+
+public extension TimeZone {
+    
+    // MARK: Zones
+
+    /// Greenwich Mean Time or UTC+0
+    static let gmt = TimeZone(secondsFromGMT: 0)
+    
+}