Migration environment set from command line args

Still defaults to 'development' if NODE_ENV isn't set so backwards compatibility is ensured.
(Subjectively) improve copy in binary

Also replaced one thrown error with a console.log. The rest of the errors were not thrown, and since this file is run from the shell, it will be an edge case that it will ever be caught. It looks messy when it happens. So it now returns an exit code of 1 to indicate things went sideways.
Include a done() in the migration skeleton

Because I always forget to add one to 'down' and then my migrations don't undo.

Also upgraded a ==.
Throw nicer errors when we can't read config.json

And quit with a code after outputting it.
Make migrations more verbose and time migrations
Merge branch 'master' of github.com:sequelize/sequelize
Merge branch 'make_binary_verbose' of git://github.com/terraflubb/sequelize into terraflubb-make_binary_verbose
fixed logging
more verbose binary
Merge branch 'terraflubb-make_binary_verbose'