Quantum needs proper packaging

This is in now

Hi Brad,

Nice work on the new structure for the plugins, but I think you missed something.
Since you commit, I can't install quantum with `python setup.py install --venv`

Exception: Command "pip install /root/quantum_default/common -E /root/quantum_default/.quantum-venv" failed.
Exception:
Traceback (most recent call last):
  File "/usr/lib/pymodules/python2.6/pip/basecommand.py", line 120, in main
    self.run(options, args)
  File "/usr/lib/pymodules/python2.6/pip/commands/install.py", line 153, in run
    InstallRequirement.from_line(name, None))
  File "/usr/lib/pymodules/python2.6/pip/req.py", line 98, in from_line
    return cls(req, comes_from, url=url)
  File "/usr/lib/pymodules/python2.6/pip/req.py", line 38, in __init__
    req = pkg_resources.Requirement.parse(req)
  File "/root/quantum_default/.quantum-venv/lib/python2.6/site-packages/pkg_resources.py", line 2582, in parse
    reqs = list(parse_requirements(s))
  File "/root/quantum_default/.quantum-venv/lib/python2.6/site-packages/pkg_resources.py", line 2495, in parse_requirements
    raise ValueError("Missing distribution spec", line)
ValueError: ('Missing distribution spec', '/root/quantum_default/common')

Oops.. ok, I'll take a look. Thanks!