Updates and fixes

Updates for exchange/ and agent setup.

ALL-IN-ONE

Changes to new base (0.4.0) with all components required:

1. exchange - Open Horizon exchange
2. agent - Open Horizon agent
3. services - Open Horizon services

Running "make all" will build all three and push built services container images to Docker hub and publish to the Open Horizon exchange.

0.2.1

Refactoring and new services for GPU enabled YOLO as well as ALPR and FACE.

Operational `exchange` and `services`

Updated to use latest Open Horizon exchange container versions (see exchange/ directory).

Fixes for build process in services/ directory to accomodate changes to the hzn command.

New script for installing Open Horizon agent software (LINUX only) in sh/get.horizon.sh; the prior mechanism using apt is no longer correctly functioning; a macOS version will be provided ASAP.

New SETUP.md documentation for "soup to nuts" to stand-up OH exchange and populate with services.

Additional documentation and testing for pattern publishing is TBD.

Integration of tegra and cuda

General clean-up, bug fixes, and re-factoring of directory structure; and documentation improvements.

The yolo service now has versions for the virtual architectures of cuda for AMD64/nVidia and tegra for ARMv8/nVidia; these are equivalent to Intel/LINUX w/ PCI GPU card and nVidia Jetson family, e.g. Nano and TX2. The service label remains yolo across all versions; specialization may be performed by indicating the url for the service.

Stable across the board

Some services still in-flight, but build process is clean and operational.