make contrib module development and testing easier

## Expected Behavior
I would like to work on contrib modules and when I run SimpleSensor i would like for it to use the directory where i am developing my module as a load path. This would allow me to make changes and test before committing my new module work.

## Actual Behavior
The modules have to live under SimpleSensor base project and you have to put the code under that tree to run and test so you have to check in your code and use cli to update module directory under SS.

## Environment details (OS, Python/package versions, any other hardware)
- python 3.6
- windows

## Steps to reproduce
1. try to dev and test a new module