[Pending review & fix tests] Make it faster

All the page load fixes combined into one Pull Request

Contains
- #208 
- #209 
- #210 
- #211
- #212 

This PR is deployed to testing server.

Google page speed before optimizations: 48
http://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Faalto.sharetribe.com

Google page speed after optimizations: 77
http://developers.google.com/speed/pagespeed/insights/?url=http%3A%2F%2Fdemo.sharetribe.us