Fix for use with cf-grid 0.9.0

- Updates bower.json to no longer need alternate `exportsOverride`
- Adds `grid_` prefix to grid mixins in `main.less`

Also, cf-demo wanted a version of jQuery no greater than 1.10.x, but one of cf-demo's _dependencies_ requires jQuery 1.11.x, so this bumps the required version of jQuery.