Fix memory leak in createPDFDataWithBitmapImage

[AndreiArdelean1]

Fixes #12

[dreampiggy]

Opppps...Seems this leak exists long times ago.

I'll run Xcode analayze and memory leak detection after merging your PR as well.

[dreampiggy]

Seems there are more issues after changes

[dreampiggy]

The correct fix should be:

{
    ...   
    NSData *result = [pdfData copy];
    
    CGDataConsumerRelease(pdfConsumer);
    CGContextRelease(context);

    return result;
}

The CGImageRef is GET rule (because it's get from UIImage's own buffer), so do not call Release on it.

[dreampiggy]

Released v1.0.1