shebang magic

Attempt to support debian systems which have renamed `node` to `nodejs`

To avoid errors like:

````
npm WARN This failure might be due to the use of legacy binary "node"
npm WARN For further explanations, please read
/usr/share/doc/nodejs/README.Debian
```

README.Debian states:

```
nodejs command
--------------

The upstream name for the Node.js interpreter command is "node".
In Debian the interpreter command has been changed to "nodejs".

This was done to prevent a namespace collision: other commands use
the same name in their upstreams, such as ax25-node from the "node"
package.

Scripts calling Node.js as a shell command must be changed to instead
use the "nodejs" command.
```