Add Car Rental Widget from Landing Pages

Sub-commits:

+ Add the details for the data folder to the Grunt config
+ Reduce line count of data files somewhat
+ Code review fixes
+ Reorganise styleguide.js dependencies
+ Code review fixes
+ Further code review fixes
+ Fix up styleguide.js file after rebase
+ Update fonts to latest commit
+ Alphabetically sort the currencies
+ Code review comments
+ Fix up the country/currency select field interaction
+ Only generate currency and country drop downs after dom ready
+ Remove travel insurance JS as it's no longer needed
+ Code review comments
+ Get rid of magic number for selecting default time