fixed naming conventions and used RecyclableMemoryStream instead of M…

[01Vladimir10]

…emoryStream

[mlhpdx]

Just FYI, I'm looking at this. The pooled memory stream seems like a win (here and in the seekable-s3-stream code as well).

[inbarbarkai]

I recommend getting a factory method in the constructor to create memory streams.
That way you can inject the manager you want to use.

Example:

class MyClass
{
    private readonly Func<MemoryStream> _streamFactory;

    public MyClass(Func<MemoryStream> streamFactory = null)
    {
        _streamFactory = streamFactory ?? () => new MemoryStream();
    }
}