Gravatar need a cropping mechanism

cc/ @creamzy @skyruler @dblessing Currently when you upload an image to be your Gravatar it will be set as equal width and height. We need to add either:

1. A modal which allows you to crop. Like this: ![Screen_Shot_2016-01-14_at_8.59.52_AM] (/uploads/4ee21f472793bc2beb846cbb84ea3e55/Screen_Shot_2016-01-14_at_8.59.52_AM.png)

2. Automatically crop from the center (or do some facial recognition).

Currently the image is getting stretched because of the assumption that everyone is uploading a square image.

@JobV Can you suggest a milestone?