Documentation overhaul

[jmdobry]

• - Comb through the API and make sure it is fully and correctly documented with examples
  • - Async methods
  • - Sync methods
  • - http adapter
  • - localStorage adapter
• - Flesh out the guides to be more thorough
• - Make a clearer distinction between the data store (DS), adapters, and angular-cache
• - Refresh the style/design of the documentation site
• - Remove the chart
• - Add important links to documentation home page
• - Fix responsive styles
• - Add prerender or something for SEO