Add Wrap() functions for encoding JSON arrays

This commit introduces two new `Wrap()` overloads that return either
an array of JSON dictionaries, or JSON-based NSData that has a root
array object - by passing in an array of objects.

Author: JohnSundell

Wrap.swift

@@ -74,15 +74,33 @@ public func Wrap<T>(object: T, dateFormatter: NSDateFormatter? = nil) throws ->
 }
 
 /**
- *  Alternative `Wrap()` implementation that returns JSON-encoded NSData
+ *  Alternative `Wrap()` overload that returns JSON-based `NSData`
  *
  *  See the documentation for the dictionary-based `Wrap()` function for more information
- *  and customization options.
  */
 public func Wrap<T>(object: T, writingOptions: NSJSONWritingOptions? = nil, dateFormatter: NSDateFormatter? = nil) throws -> NSData {
     return try Wrapper(dateFormatter: dateFormatter).wrap(object, writingOptions: writingOptions ?? [])
 }
 
+/**
+ *  Alternative `Wrap()` overload that encodes an array of objects into an array of dictionaries
+ *
+ *  See the documentation for the dictionary-based `Wrap()` function for more information
+ */
+public func Wrap<T>(objects: [T], dateFormatter: NSDateFormatter? = nil) throws -> [WrappedDictionary] {
+    return try objects.map({ try Wrap($0) })
+}
+
+/**
+ *  Alternative `Wrap()` overload that encodes an array of objects into JSON-based `NSData`
+ *
+ *  See the documentation for the dictionary-based `Wrap()` function for more information
+ */
+public func Wrap<T>(objects: [T], writingOptions: NSJSONWritingOptions? = nil, dateFormatter: NSDateFormatter? = nil) throws -> NSData {
+    let dictionaries: [WrappedDictionary] = try Wrap(objects)
+    return try NSJSONSerialization.dataWithJSONObject(dictionaries, options: writingOptions ?? [])
+}
+
 /**
  *  Protocol providing the main customization point for Wrap
  *

WrapTests.swift

@@ -659,6 +659,24 @@ class WrapTests: XCTestCase {
             XCTFail(error.toString())
         }
     }
+    
+    func testWrappingArray() {
+        struct Model {
+            let string: String
+        }
+        
+        do {
+            let models = [Model(string: "A"), Model(string: "B"), Model(string: "C")]
+            let wrapped: [WrappedDictionary] = try Wrap(models)
+            XCTAssertEqual(wrapped.count, 3)
+            
+            try VerifyDictionary(wrapped[0], againstDictionary: ["string" : "A"])
+            try VerifyDictionary(wrapped[1], againstDictionary: ["string" : "B"])
+            try VerifyDictionary(wrapped[2], againstDictionary: ["string" : "C"])
+        } catch {
+            XCTFail(error.toString())
+        }
+    }
 }
 
 // MARK: - Mocks