Update map

Changes:
* picture icon for deployments with photo galleries
* an 'About this map' button & modal
* Better infowindows courtesy of @jamalex
* each modal comes with a hash that can be directly linked to (on page load, if a hash is present it triggers the modal and then centers and zooms the map over that deployment
* a request to contact footer at the bottom of each deployment modal which sends an email to implementations with a useful subject line

Notes to selves (still to fix):
* we're loading all pictures for all deployments in the background on page load, which will get messy when we have more albums
* would be good to enforce a max picture height so we could ensure that the slider will look good on all screen sizes 
* refactor this into backbone