Cleanup ExpDirOps and devconfig

[miketynes]

closes #41

ExpDirOps:

• rename to clarify intent
• clean up try/excepts:
  • reduce usage of try from 3 to 1
  • make except more strict by parsing gspread response

createjson.py:

• cleanup helper functions
• create funs in utils and vars in devconfig to extensively read interface files based on file presence

Devconfig:

• remove unneeded code
• add dev lab
• add valid_interface_filenames

Utils:

• see above under createjson.py point 2

[miketynes]

Encountered this error: https://gist.github.com/miketynes/2277a01dafb662700a929c8e87fb43f2

fixed with 967501a

[miketynes]