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. 
That's may well be an issue with how I expressed myself. My intent was that we shouldn't make any significant investment in terms of refactoring or improving the canvas_utils code since it'll eventually be replaced by the SDK. Since we don't have the SDK yet, though, it makes sense to add any additional methods that we need for now into canvas_utils since it's got the existing setup logic rather than duplicating that code elsewhere.