add bower components to gitignore
add bower components to gitignore

osmlab/maproulette,mvexel/maproulette,mvexel/maproulette,osmlab/maproulette,Crashfreak/maproulette,Crashfreak/maproulette,Crashfreak/maproulette,mvexel/maproulette,osmlab/maproulette,Crashfreak/maproulette,mvexel/maproulette,osmlab/maproulette