make mochifmt use mochinum only when available
make mochifmt use mochinum only when available

rabbitmq/mochiweb,ubf/mochiweb,RJ/mochiweb-websockets,riak-synrc/mochiweb,robertkowalski/mochiweb,jasonjli/mochiweb,rcouch/couchdb-mochiweb,jasonjli/mochiweb,ubf/mochiweb,robertkowalski/mochiweb,danogwok/mochiweb,tsingpan/mochiweb,mdg/mochiweb,GOFactory/mochiweb,vinoski/mochiweb,danogwok/mochiweb,vinoski/mochiweb,rabbitmq/mochiweb,tsingpan/mochiweb,GOFactory/mochiweb,cloudant/mochiweb,kuenishi/mochiweb,heroku/mochiweb