Release v3.7.0

Installation image, md5sum, and installation guide:

• https://berrynet.s3.amazonaws.com/images/2019-07-15-raspbian-buster-berrynet.zip
• https://berrynet.s3.amazonaws.com/images/2019-07-15-raspbian-buster-berrynet.md5sum
• https://github.com/DT42/BerryNet/wiki/Installation

Features and Improvements

1. Use TFLite as default engine
2. Add bn_{tflite, openvino, darknet} CLI executors
3. Update TFLite support to 1.14.0
4. Update OpenVINO support to 2019R1.1

Incompatible Changes

N/A