Change the NSCache API to match the Darwin version (#322)

Author: Pushkar N Kulkarni

Foundation/NSCache.swift

@@ -38,7 +38,7 @@ public class NSCache : NSObject {
 
     public weak var delegate: NSCacheDelegate?
 
-    public func objectForKey(_ key: AnyObject) -> AnyObject? {
+    public func object(forKey key: AnyObject) -> AnyObject? {
         var object: AnyObject?
 
         let keyRef = unsafeBitCast(key, to: UnsafePointer<Void>.self)
@@ -157,7 +157,7 @@ public class NSCache : NSObject {
         _lock.unlock()
     }
 
-    public func removeObjectForKey(_ key: AnyObject) {
+    public func removeObject(forKey key: AnyObject) {
         let keyRef = unsafeBitCast(key, to: UnsafePointer<Void>.self)
 
         _lock.lock()

Foundation/NSString.swift

@@ -149,7 +149,7 @@ internal func _createRegexForPattern(_ pattern: String, _ options: NSRegularExpr
         }()
     }
     let key = "\(options):\(pattern)"
-    if let regex = local.__NSRegularExpressionCache.objectForKey(key._nsObject) {
+    if let regex = local.__NSRegularExpressionCache.object(forKey: key._nsObject) {
         return (regex as! NSRegularExpression)
     }
     do {