Bring in colors and fonts from GDCR landing page

See https://github.com/coreyhaines/GDCR
Extract sponsors sidebar into partial
Update Rails version to 3.2.20
Change seeds file to work with more realistic data
Extract Google analytics script into partial
Clean up app layout
Extract CSS Normalization to separate file
Use a light background and chosen body font
Use new fonts
Make links consistent
Remove unused and old styling
Begin styling with bourbon and neat

See http://bourbon.io
See http://neat.bourbon.io
Pretty up the coderetreat listings
Add a shadow to the event cards
Add a small map next to each coderetreat
Steal sponsors section from GDCR landing page

See https://github.com/coreyhaines/GDCR
Add thoughtworks as a galaxy sponsor