First Alpha release for playground

• Added support for automatic model download if not present in the directory and then continue.
• Better path handling(more incoming).
• Minor fixes and improvements.
• Release also available at testpypi.

Object Detection app release

• Added object detection tensorflow model zoo models support.
• Updated Flask handling of files.
• Object detection uses subprocess for executing the model.
• SQLite database support.
• Comes with Procfile for easy deployment on Heroku.