update the bing if statement
validate the bing maps api key
validate the bing maps api key ~ to all the other leaflet apps
compartementalize the base map options JS and html
remove the block from base map options tempalte
add referance to bing.js
Merge branch 'master' into consistent-base-maps
Merge pull request #216 from gem/consistent-base-maps

Consistent base maps
fix merge conflicts and add bing api key workaround to irv viewer