Add public initializers

Sources/PushAPI/AuthenticatedPushMessage.swift

@@ -14,4 +14,14 @@ public struct AuthenticatedPushMessage: Codable {
     /// The message to send
     public let message: PushMessage
 
+    /**
+     Create an authenticated push message
+     - Parameter sender: The authentication of the sender
+     - Parameter message: The message metadata and content
+     */
+    public init(sender: DeviceAuthentication, message: PushMessage) {
+        self.sender = sender
+        self.message = message
+    }
+
 }

Sources/PushAPI/DeviceAuthentication.swift

@@ -19,4 +19,14 @@ public struct DeviceAuthentication: Codable {
      */
     public let authentication: AuthenticationToken
 
+    /**
+     Create a device authentication object.
+
+     - Parameter pushToken: The APNs device token
+     - Parameter authentication: The authentication token generated by the server
+     */
+    public init(pushToken: PushToken, authentication: AuthenticationToken) {
+        self.pushToken = pushToken
+        self.authentication = authentication
+    }
 }

Sources/PushAPI/DeviceDecision.swift

@@ -12,4 +12,15 @@ public struct DeviceDecision: Codable {
 
     /// The hash of the master key to authenticate the request.
     public let masterKeyHash: Data
+
+    /**
+     Create a decision object to approve or reject a device registration.
+
+     - Parameter pushToken: The APNs device token
+     - Parameter masterKeyHash: The SHA256 hash of the administrator master key.
+     */
+    public init(pushToken: PushToken, masterKeyHash: Data) {
+        self.pushToken = pushToken
+        self.masterKeyHash = masterKeyHash
+    }
 }

Sources/PushAPI/DeviceRegistration.swift

@@ -17,4 +17,16 @@ public struct DeviceRegistration: Codable {
      The name is displayed when registered users request a list of all devices in an application.
      */
     public let name: String
+
+    /**
+     Create a new device registration object.
+     - Parameter pushToken: The push token to register
+     - Parameter application: The application the device uses
+     - Parameter name: A descriptive name of the device.
+     */
+    public init(pushToken: PushToken, application: ApplicationId, name: String) {
+        self.pushToken = pushToken
+        self.application = application
+        self.name = name
+    }
 }

Sources/PushAPI/DeviceUpdate.swift

@@ -10,4 +10,15 @@ public struct PushTokenUpdate: Codable {
 
     /// The new push token to register
     public let newToken: PushToken
+
+    /**
+     Create a device authentication object.
+
+     - Parameter device: The authentication of the device requesting the change.
+     - Parameter PushToken: The new APNs token to use from now on
+     */
+    public init(device: DeviceAuthentication, newToken: PushToken) {
+        self.device = device
+        self.newToken = newToken
+    }
 }

Sources/PushAPI/PushMessage.swift

@@ -55,6 +55,33 @@ public struct PushMessage: Codable {
      In general, the topic is your app’s bundle ID/app ID. It can have a suffix based on the type of push notification. If you’re using a certificate that supports PushKit VoIP or watchOS complication notifications, you must include this header with bundle ID of you app and if applicable, the proper suffix. If you’re using token-based authentication with APNs, you must include this header with the correct bundle ID and suffix combination. To learn more about app ID, see [Register an App ID](https://help.apple.com/developer-account/#/dev1b35d6f83).
      */
     public let topic: String?
+
+    /**
+     Create a new push message.
+
+     - Parameter recipients: A list of push tokens for all recipients of the message
+     - Parameter payload: The message content and metadata
+     - Parameter pushType: The content type of the message
+     - Parameter topic: The topic id
+     - Parameter expiration: An optional expiration date for the message
+     - Parameter lowPriority: Specify `true` to deliver message with lower priority
+     - Parameter collapseIdentifier: An optional identifier to group push notifications
+     */
+    public init(recipients: [PushToken],
+                payload: APNSwiftPayload,
+                pushType: APNSwiftConnection.PushType,
+                topic: String,
+                expiration: Date? = nil,
+                lowPriority: Bool = false,
+                collapseIdentifier: String? = nil) {
+        self.recipients = recipients
+        self.payload = payload
+        self.pushType = pushType
+        self.topic = topic
+        self.expiration = expiration
+        self.lowPriority = lowPriority
+        self.collapseIdentifier = collapseIdentifier
+    }
 }
 
 extension APNSwiftConnection.PushType: Codable {