Freddie Wang

I made some changes to support coroutines which can improve the downloading performance. If you're interested in, please check my branch https://github.com/wangyung/safaribooks/tree/feature/coroutines P.S: I've merged the login fix so I...

Currently it only supports free-style shape, but it is also useful to support static shape like square, oval, circle, etc.

when using ```withOutput(File)``` or ```withOutput(Uri)```, as long as the file or uri is under the path of ```getExternalFilesDir()```. There is always an exception like this ``` E/HiResBackgroundService: handled save error:...