Critical error: relationships multiply Math
Every time you hit "update layout" it adds the previous value on top of an existing one and therefore destroys the whole layout.

If you define a relationship between a text-layer and its background (for instance to model consistent padding for a button), I define a left and right margin of 22px. Every time you hit update layout, 22px gets added to the already existing 22px and so on.

<img width="316" alt="screen shot 2017-08-22 at 3 20 06 pm" src="https://user-images.githubusercontent.com/113188/29567427-75781210-874d-11e7-81cb-90daef139033.png">


This error unfortunately makes the whole plugin unusable.