Add synonyms.bag

This is a simpler way to do query expansion for certain use cases. Instead of splicing the synonym into the original query text, this simply appends a single query for the synonym. IE

dog => pooch
dog => hound
bite => chomp
bite => gnash

q=dog bite
would yield:
dismax(dog bite) OR dismax(hound) OR dismax(chomp) OR dismax(gnash)