Kitchen sink: Garber-Irish, kill turbolinks, SCSS.

* Implement the Garber-Irish pattern (Javascript-per-page-in-Rails) using the `gistyle` gem.
* Remove turbolinks, it was causing too many problems between DataTables and Google Maps, for no real win exactly.
* Bootstrap/Google Maps CSS compatibility fixes: use `content-box` for the map, and `min-size: none` on images
* Fix SCSS to not use sprockets, but Sass @imports instead. This allows us to use the Bootstrap mixins from anywhere.