specify ubuntu version; correct apt-get stmts

Need to use ubuntu:precise or else the wrong version of django and other
crap gets installed and everything is shitty.  Make apt-get statement
apt-get upgrade, as probably intended.  Remove commented out stuff.
make pkgs easy to read; add nodejs & npm + symlink
install at /opt/; pip install daemonize
add port 8126 to docker run call
use ubuntu precise rather than wheezy