Fix code styles

Kingfisher/String+MD5.swift

@@ -114,7 +114,7 @@ func rotateLeft(value: UInt32, bits: UInt32) -> UInt32 {
     return ((value << bits) & 0xFFFFFFFF) | (value >> (32 - bits))
 }
 
-class MD5 : HashBase {
+class MD5: HashBase {
     
     /** specifies the per-round shift amounts */
     private let shifts: [UInt32] = [7, 12, 17, 22,  7, 12, 17, 22,  7, 12, 17, 22,  7, 12, 17, 22,
@@ -212,10 +212,10 @@ class MD5 : HashBase {
         
         let buf: NSMutableData = NSMutableData()
         hh.forEach({ (item) -> () in
-            var i:UInt32 = item.littleEndian
+            var i: UInt32 = item.littleEndian
             buf.appendBytes(&i, length: sizeofValue(i))
         })
         
-        return buf.copy() as! NSData
+        return NSData(data: buf)
     }
 }

Kingfisher/UIImage+Extension.swift

@@ -78,7 +78,7 @@ extension UIImage {
         let contextHolder = UnsafeMutablePointer<Void>()
         let context = CGBitmapContextCreate(contextHolder, CGImageGetWidth(imageRef), CGImageGetHeight(imageRef), 8, 0, colorSpace, bitmapInfo)
         if let context = context {
-            let rect = CGRectMake(0, 0, CGFloat(CGImageGetWidth(imageRef)), CGFloat(CGImageGetHeight(imageRef)))
+            let rect = CGRect(x: 0, y: 0, width: CGImageGetWidth(imageRef), height: CGImageGetHeight(imageRef))
             CGContextDrawImage(context, rect, imageRef)
             let decompressedImageRef = CGBitmapContextCreateImage(context)
             return UIImage(CGImage: decompressedImageRef!, scale: scale, orientation: self.imageOrientation)

Kingfisher/UIImageView+Kingfisher.swift

@@ -299,7 +299,7 @@ public extension UIImageView {
                         let indicatorStyle = UIActivityIndicatorViewStyle.Gray
                     #endif
                     let indicator = UIActivityIndicatorView(activityIndicatorStyle:indicatorStyle)
-                    indicator.center = CGPointMake(CGRectGetMidX(bounds), CGRectGetMidY(bounds))
+                    indicator.center = CGPoint(x: CGRectGetMidX(bounds), y: CGRectGetMidY(bounds))
                     
                     indicator.autoresizingMask = [.FlexibleLeftMargin, .FlexibleRightMargin, .FlexibleBottomMargin, .FlexibleTopMargin]
                     indicator.hidden = true