Also added dirspec directly to the setuptools for now,
because it needs the dependency along with the url, but pip
would break if it had both

Leap pycommon will now be installed in editable mode
when you use pip install, so that you can run the tests
and develop using only pip

I also added a conditional to the setup.py so
that python setup.py develop can be used even
with the dirspec url

--use-leap-wheels sets --trusted-host (remove it when we have a proper
  cert) and WHEELHOUSE to https://ftp.lizard.leap.se

Until we get ftp.lizard cname, use lizard as the wheels server.

generate_wheels uses $WHEELHOUSE to generate and store the wheels for
requirements.pip and requirements-testing.pip (if it exists).

pip_install_requirements.sh installs requirements.pip from them if
possible (if not, then it fetches them from pypi) or, if passed the
--testing flag, it installs requirements-testing.pip.

- update pip
- install base reqs, with insecure flags for dirspec. fuck canonical.