Ignore node_modules/*.js

I was getting require() errors since lib/ doesn't appear to be in NODE_PATH
and the calls don't use relative paths (on node.js v0.6.21). Since I didn't
want to update all the require() calls, I simply compiled the Coffeescript
into node_modules with:

    $ coffee -c -o node_modules lib/*.coffee
Log build output to the console

For easier debugging, this logs the output from the bash build scripts,
prefixed with the build ID.