stop compiling CSS dynamically

drawback: need to `make build` after changing CSS
advantage: simpler setup, less magic
updated stylus and nib
all fonts formats are kept as files
use stylus-font-face to properly define and embed fonts
add widget support for iframe resizing

if liftie is embedded in an iframe it informs its parent about the ideal
height of the iframe component

the data sent includes `height` and `resort` and allows host to resize
the iframe accordingly
add script that allows to embed liftie widgets

in order to embed resort widget in the page you need to:
    <div class="liftie-widget" data-resort="alta">
    <script src="http://liftie.info/scripts/liftie-embed.min.js" defer>
Merge remote-tracking branch 'origin/inline-data-uris'
Merge remote-tracking branch 'origin/widget-height'