WIP #10 - Add credentials

Api/Classes/Credentials.swift

+//
+//  Credentials.swift
+//  Pods
+//
+//  Created by Mauro Bender on 25/8/16.
+//
+//
+
+struct Credentials {
+	let grantType: String
+	let data: [ String: String ]
+	
+	func serialize() -> [ String: String ] {
+		var data = self.data
+		data += [ "grant_type": grantType ]
+		
+		return data
+	}
+}
+
+extension Credentials {
+	init( username: String, password: String, extra: [ String: String ]? = nil ) {
+		self.grantType = "password"
+		
+		var data  = [ "username": username, "password": password ]
+		if extra != nil { data += extra }
+		
+		self.data = data
+	}
+	
+	init( assertion: String, extra: [ String: String ]? = nil ) {
+		self.grantType = "assertion"
+		
+		var data  = [ "assertion": assertion ]
+		if extra != nil { data += extra }
+		
+		self.data = data
+	}
+	
+	public static func password( username: String, password: String, extra: [ String: String ]? = nil ) -> Credentials {
+		return Credentials( username: username, password: password, extra: extra )
+	}
+	
+	public static func facebook( token: String, extra: [ String: String ]? = nil ) -> Credentials {
+		return Credentials( assertion: token, extra: extra )
+	}
+}

Api/Classes/Utils.swift

@@ -12,4 +12,12 @@ func += <K, V> (inout left: [K:V], right: [K:V]) {
 	for (k, v) in right {
 		left.updateValue(v, forKey: k)
 	}
+}
+
+func += <K, V> (inout left: [K:V], right: [K:V]?) {
+	guard right != nil else { return }
+	
+	for (k, v) in right! {
+		left.updateValue(v, forKey: k)
+	}
 }
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