Added servo size prompt to project create

Allows the user to specify their servo size when creating a new project
from the CLI. This is an optional value, congress will default to the
correct value if no servo size is chosen.
Fixed an issue where scale could get stuck

Now checks the existing status of the project to see if it's in a
running state before attempting to scale. Only wait for the project to
be back in running if the project was already running.

Closes #28
Updated servo size prompt

Added units and changed the formatting to make everything clearer.
Merged in feature/servo-size-select (pull request #29)

Adds servo select and fixes scaling
3.0.0