Redesigning site and adding search functionality

Added gems for json and nokogirl
Added rake build for generating json index
Updated gitignore to exclude sublime project files
Removed unused javascript
Renamed css directory to stylesheets
Updated config.rb to reflect change in directory name
Added page to test search
Rolled back lunr search and added topics page

Removing gems for lung search
Updating rake file to handle different operating systems
Added topics page
Styling site, adding topics page functionality
Updated navigation and refined design
Updated site with new look
Removed _site folder

Updated gitignore
Fixed header/navigation and topics page
Removed unused files.
Updated css for about page
Removed _site