Feature/add people tool

1)Added logic for editing a section. Provided the helper method to invoke the API - needs to plugin the UI logic to invoke this. 
2)Unit tests to follow. This is the next task I have on my list. 
Would this method make more sense in the canvas_utils.py file? I know it should go away once the SDK comes online, but up to that point we may be able to take advantage of some of the configuration and setup code there.