Adds the possibility to turn maps on and off in the contact page

exampleSite/data/contact.yml

 headingSpan : Touch
 title : Contact Details
 content : Lorem ipsum dolor sit amet, consectetur adipisicing elit. Ipsam, vero, provident, eum eligendi blanditiis ex explicabo vitae nostrum facilis asperiores dolorem illo officiis ratione vel fugiat dicta laboriosam labore adipisci.
+enable_maps : false
 mapLatitude : 51.5223477
 mapLongitude: -0.1622023
 contactDetails :

layouts/partials/contact.html

         </div>
     </div>
 
+    {{ if .Site.Data.contact.enable_maps }}
     {{"<!-- Google Map -->" | safeHTML}}
     <div class="google-map">
         <div id="map-canvas" {{ with .Site.Data.contact.mapLatitude }} data-latitude="{{ . }}" {{ end }} 
         {{ with .Site.Data.contact.mapLongitude }} data-longitude="{{ . }}" {{ end }}></div>
     </div>
+    {{ end }}
 
 </section>
 {{"<!-- /contact -->" | safeHTML}}