Refactor calorie counter

[drodil]

Refactor calorie counter to take the volume as input (relates also to #109 ). Remove the abv_calories.rs from the util library as the calorie count can be calculated for abv easily by multiplying the beers ABV % by a factor of ~2.5 and then multiplying that number by how many fluid ounces the bottle holds. To make this easier, the volume should come as measurements::Volume struct.