Display Calories of Single-Food Image

[mikeczech]

As an end user I want to quickly estimate calories from images of food so that I can determine it it fits into my healthy eating plan.

Given the camera displays a single item of food
When the button for taking a picture is pressed
Then an estimation for the amount of calories of that item appears

Note that the estimation of calories can be arbitrary (e.g. random).

This issue depends on #2