Basic interactive prompt.

Not unit tested yet as I'm still figuring this part out but the basics are there. Running the example CLI with the shell command launches it.
Modified commands for interactive prompt.
Attempt to move CLI into main app. Added a conversion builder.

Moving example CLI into main app modifications to follow. build_converter is a string to data type converter converter. There is extensive docs, notes and examples in it's code.
Integrated build_converter functionality to the commands.

Added build_converter functionality to add_field, edit and append.
Shell appears to be working. Tests still required though.
You sneaky file >:|
Preparing for initial pypi launch!
alec y u no splat?!