Performance Improvements: Enable compression and make use of browsers cache

[svnlto]

Gzip

• https://developers.google.com/speed/docs/best-practices/payload#GzipCompression

Browser cache

• Cache-Control HTTP header reference
• http://stackoverflow.com/questions/12826017/how-can-i-control-caching-for-static-assets-when-using-sinatra - need to use url queries?
• Timestamp css/js
• Sinatra Cache Control
• Rack::StaticCache
• sinatra-asset-pipeline
  • Problems with query string method
    Note that shotgun does its own thing for static files, so asset caching doesn't work on development (but tests can show it working)