Switch to an OOP implementation

[denbonte]

Now that the pipeline is pretty much set up and we know what we need and want/might implement, switch to an OOP implementation.

The idea is to have an "MHubContainer" class with a bunch of methods such as:

• build
• inspect
• test
• push
• comms with the MHub DB

And a bunch of attributes such as

• path to dockerfile
• image ID
• whether the image is a base image or a model image
• base image id (if the image is not a base image)
• associated testing data

The pipeline will then fetch all of the images to build, test, push and comm with the server, starting from config files.