Fix for breakage after Modernizr 3.0.
Fix for breakage after Modernizr 3.0.

Perhaps temporary, if they fix it properly on Modernizr's end of things. See: https://github.com/Modernizr/grunt-modernizr/issues/118

Fixes #4094
richardhinkamp/bolt,nikgo/bolt,Raistlfiren/bolt,xeddmc/bolt,Intendit/bolt,nantunes/bolt,winiceo/bolt,HonzaMikula/masivnipostele,xeddmc/bolt,hannesl/bolt,Intendit/bolt,hugin2005/bolt,nikgo/bolt,codesman/bolt,bolt/bolt,rarila/bolt,one988/cm,codesman/bolt,HonzaMikula/masivnipostele,xeddmc/bolt,rossriley/bolt,CarsonF/bolt,richardhinkamp/bolt,romulo1984/bolt,hugin2005/bolt,richardhinkamp/bolt,cdowdy/bolt,Intendit/bolt,Raistlfiren/bolt,rarila/bolt,electrolinux/bolt,HonzaMikula/masivnipostele,nantunes/bolt,nikgo/bolt,one988/cm,Eiskis/bolt-base,joshuan/bolt,lenvanessen/bolt,GawainLynch/bolt,CarsonF/bolt,GawainLynch/bolt,joshuan/bolt,bolt/bolt,romulo1984/bolt,joshuan/bolt,bolt/bolt,winiceo/bolt,Eiskis/bolt-base,lenvanessen/bolt,nantunes/bolt,tekjava/bolt,hannesl/bolt,codesman/bolt,HonzaMikula/masivnipostele,electrolinux/bolt,cdowdy/bolt,Eiskis/bolt-base,joshuan/bolt,hugin2005/bolt,richardhinkamp/bolt,marcin-piela/bolt,winiceo/bolt,romulo1984/bolt,electrolinux/bolt,lenvanessen/bolt,hannesl/bolt,rarila/bolt,tekjava/bolt,Intendit/bolt,lenvanessen/bolt,Raistlfiren/bolt,hannesl/bolt,CarsonF/bolt,marcin-piela/bolt,marcin-piela/bolt,marcin-piela/bolt,rossriley/bolt,Raistlfiren/bolt,GawainLynch/bolt,romulo1984/bolt,codesman/bolt,xeddmc/bolt,one988/cm,electrolinux/bolt,nantunes/bolt,rarila/bolt,winiceo/bolt,one988/cm,GawainLynch/bolt,rossriley/bolt,hugin2005/bolt,nikgo/bolt,cdowdy/bolt,tekjava/bolt,CarsonF/bolt,cdowdy/bolt,tekjava/bolt,Eiskis/bolt-base,bolt/bolt,rossriley/bolt