Created leaflet view and map_leaflet partial, in order to allow the display of a leaflet version of the map
Added controller action, finishing off the 'server-side' stuff that I need to implement before sorting out the leaflet map itself
Bundle updated to tweak rspec and ensure that shoulda matchers were working.

Added conditional statements to the various map javascripts to ensure they would not run if the appropriate selector was not present on the page.

Added basic leaflet map to the leaflet page