Allow for x-y coordinates to be negative and subtract from width-height about squib HOT 4 CLOSED

After playing around with this, I'm not sure I like it. I would rather run the layout.yml through ERB so we can do stuff like:

title:
  x: <%=@width-75%>

from squib.

Ooh, ERB for layouts would be awesome! It would move much of my positioning code out of the deck.rb and into the layout, where it belongs!

For example, If I want to draw a circle around some text. I could easily use ruby expressions to offset the circle so that its origin is positioned correctly to make the circle go around the text.

SomeText:
   x: 50
   y: 50
   width: 150
   height: 150

SomeTextCircle:
    x: <%=@x - 20%>
    y: <%=@y - 20%>
from squib.

Actually, you don't need ERB for that situation - use extends:

SomeText:
  x: 50
  y: 50
SomeTextCircle:
  extends: SomeText
  x: -= 20 # in yaml this is a string, but it gets processed as a part of processing "extends"
  y: -= 20

http://andymeneely.github.io/squib/doc/file.README.html#Special_key__extends

But... there are other situations where ERB would be helpful. The issue I created for that is #36.

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Good point!

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