rs/SDWebImage — pull request #195 by JaviSoto (2012-10-12 20:46:50+00:00)
Title: Creating the CGBitmapContext with the right bytes per pixel and bitmap info depending on the original image.

This removes an error that was making ```CGBitmapContext``` return ```NULL``` with some images:

```
: CGBitmapContextCreate: unsupported parameter combination: 8 integer bits/component; 32 bits/pixel; 3-component color space; kCGImageAlphaLast; 400 bytes/row.
```