Version Fixes (Semantic Node Version File)

Because stable is a version of Node that is incompatible with Meteor websockets, `0.10.24` is now the default semver. This version is compatible with Meteor and the sockets patch.

That said, it is really a required feature to be able to specify the node version. Furthermore, with semver.io, it would be a waste to not allow the user to specify what version of node to use. In my previous commits I left the variable blank, which triggers the script to just use the default. I did this in lieu of the original method of parsing a package.json file to determine which Node version to use.

Because we don't have anything available to us that can parse JSON in the environment yet, I instead opted to have a simpler form of version specification - you can just set your semver.io compatible range in `nodeversion`, a file in your project's root.