[config] srcset added to _config.yml
[pattern] [style] [meta] initial figure
Also:
- .full figure/figcaption html and css
- fix for flow padding/margins at 60em+ (for benefit of 100% images)
- more apparent sectioning in css file
[style] a healthier approach to margin-top/bottom blocks
This prevents needing an !important rule for .full figcaption.
Only setting margin-left/right for blocks prevents overwriting
the default 1.375em * + * rule except when necessary.
Merge pull request #9 from opattison/2014-11-03-srcset

Figuring out srcset