Fix fullscreen in Safari
Fix fullscreen in Safari

[Reference](http://stackoverflow.com/questions/8427413/webkitrequestfull
screen-fails-when-passing-element-allow-keyboard-input-in-safar)

CartoDB/cartodb.js,splashblot/cartodb.js,CartoDB/cartodb.js,MappingKat/cartodb.js,greyhwndz/cartodb.js,johan--/cartodb.js,greyhwndz/cartodb.js,Stonelinks/cartodb-lite,splashblot/cartodb.js,MappingKat/cartodb.js,johan--/cartodb.js,johan--/cartodb.js,splashblot/cartodb.js,MappingKat/cartodb.js,CartoDB/cartodb.js,MappingKat/cartodb.js,Stonelinks/cartodb-lite,johan--/cartodb.js,CartoDB/cartodb.js,Stonelinks/cartodb-lite,greyhwndz/cartodb.js,splashblot/cartodb.js,Stonelinks/cartodb-lite,greyhwndz/cartodb.js