provide ability to hard version the upstream nodejs package + fix init script stop on ubuntu

using the upstream parameter for version. default to their defaults

regarding init script stop:

[...] root@graphite01:/etc# service statsd stop
 * Stopping statsd statsd         [fail]

[...] root@graphite01:~# ps aux | grep stat
root      1107  0.0  0.0   7412   660 ?        Ss   01:55   0:00 /usr/sbin/vnstatd -d
nobody   12454 12.9  1.4 968848 54564 ?        Sl   05:29   0:06 statsd                                                                          
root     12560  0.0  0.0   8108   920 pts/0    S+   05:30   0:00 grep stat

--name matches statsd not node.