Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Extensions/Accounts/Sources/ACAccountStore+AnyPromise.m

@@ -0,0 +1,48 @@
+#import "ACAccountStore+AnyPromise.h"
+#import <PromiseKit/PromiseKit.h>
+
+
+@implementation ACAccountStore (PromiseKit)
+
+- (AnyPromise *)requestAccessToAccountsWithType:(ACAccountType *)type options:(NSDictionary *)options {
+    return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
+        [self requestAccessToAccountsWithType:type options:options completion:^(BOOL granted, NSError *error) {
+            if (granted) {
+                resolve([self accountsWithAccountType:type]);
+            } else if (error) {
+                resolve(error);
+            } else {
+                error = [NSError errorWithDomain:PMKErrorDomain code:PMKAccessDeniedError userInfo:@{
+                    NSLocalizedDescriptionKey: @"Access to the requested social service has been denied. Please enable access in your device settings."
+                }];
+                resolve(error);
+            }
+        }];
+    }];
+}
+
+- (AnyPromise *)renewCredentialsForAccount:(ACAccount *)account {
+    return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
+        [self renewCredentialsForAccount:account completion:^(ACAccountCredentialRenewResult renewResult, NSError *error) {
+            resolve(error ?: @(renewResult));
+        }];
+    }];
+}
+
+- (AnyPromise *)saveAccount:(ACAccount *)account {
+    return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
+        [self saveAccount:account withCompletionHandler:^(BOOL success, NSError *error) {
+            resolve(error);
+        }];
+    }];
+}
+
+- (AnyPromise *)removeAccount:(ACAccount *)account {
+    return [AnyPromise promiseWithResolverBlock:^(PMKResolver resolve) {
+        [self removeAccount:account withCompletionHandler:^(BOOL success, NSError *error) {
+            resolve(error);
+        }];
+    }];
+}
+
+@end