iOS 10 compatibility

I'm sorry to tell you, but your library doesn't build in iOS 10 anymore.

Here is the Fix:

**DACircularProgressView.h** _line 11_

replace:

```
@interface DACircularProgressView : UIView
```

with:

```
#if __IPHONE_OS_VERSION_MAX_ALLOWED < __IPHONE_10_0
@interface DACircularProgressView : UIView
#else
@interface DACircularProgressView : UIView <CAAnimationDelegate>
#endif
```
