Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Extensions/AVFoundation/Sources/AVAudioSession+AnyPromise.h

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+//
+//  AVFoundation+AnyPromise.h
+//
+//  Created by Matthew Loseke on 6/21/14.
+//
+
+#import <AVFoundation/AVFoundation.h>
+#import <PromiseKit/AnyPromise.h>
+
+/**
+ To import the `AVAudioSession` category:
+
+    use_frameworks!
+    pod "PromiseKit/AVFoundation"
+
+ And then in your sources:
+
+    #import <PromiseKit/PromiseKit.h>
+*/
+@interface AVAudioSession (PromiseKit)
+
+/**
+ Wraps `-requestRecordPermission:`, thens the `BOOL granted` parameter
+ passed to the wrapped completion block. This promise cannot fail.
+
+ @see requestRecordPermission:
+*/
+- (AnyPromise *)requestRecordPermission;
+
+@end

Carthage/Checkouts/PromiseKit/Extensions/AVFoundation/Sources/AVAudioSession+AnyPromise.m

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+//
+//  AVAudioSession+PromiseKit.m
+//
+//  Created by Matthew Loseke on 6/21/14.
+//
+
+#import "AVAudioSession+AnyPromise.h"
+#import <Foundation/Foundation.h>
+
+
+@implementation AVAudioSession (PromiseKit)
+
+- (AnyPromise *)requestRecordPermission {
+    return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
+        [[AVAudioSession sharedInstance] requestRecordPermission:^(BOOL granted) {
+            resolve(@(granted));
+        }];
+    }];
+}
+
+@end

Carthage/Checkouts/PromiseKit/Extensions/AVFoundation/Sources/AVAudioSession+Promise.swift

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+import AVFoundation
+import Foundation
+#if !PMKCocoaPods
+import PromiseKit
+#endif
+
+/**
+ To import the `AVAudioSession` category:
+
+    use_frameworks!
+    pod "PromiseKit/AVFoundation"
+
+ And then in your sources:
+
+    import PromiseKit
+*/
+extension AVAudioSession {
+    public func requestRecordPermission() -> Guarantee<Bool> {
+        return Guarantee(resolver: requestRecordPermission)
+    }
+}