Capability to downscale output video based on a bounding box

Merge pull request #6 from pushd/output_fit_box

Capability to downscale output video track with a bounding box.

Output format resolution to be multiple of 32

Make sure A133 frames can transcode video with resolutions that are not multiple of 32.
#3

Release to test a fix out in the wild

Temp release

1.5.8-pushd

Using source format received from range request

• Adds the rotation flag to copy from source video to target video
• Adds option to indicate max height and width of the video that should be transcoded

1.5.6-pushd

• Support network source
• Add defaults to target format if one is provided and is missing some properties