Add PromiseKit dependency

- Added PromiseKit dependency

Carthage/Checkouts/PromiseKit/Tests/Bridging/Infrastructure.swift

@@ -0,0 +1,24 @@
+import PromiseKit
+
+// for BridgingTests.m
+@objc(PMKPromiseBridgeHelper) class PromiseBridgeHelper: NSObject {
+    @objc func bridge1() -> AnyPromise {
+        let p = after(.milliseconds(10))
+        return AnyPromise(p)
+    }
+}
+
+enum MyError: Error {
+    case PromiseError
+}
+
+@objc class TestPromise626: NSObject {
+
+    @objc class func promise() -> AnyPromise {
+        let promise: Promise<String> = Promise { seal in
+            seal.reject(MyError.PromiseError)
+        }
+
+        return AnyPromise(promise)
+    }
+}