added support for http/https proxies
using tempfile.NamedTemporaryFile() as suggested. removed uneccessary import.
New upstream versions: virtualenv, virtualenvwrapper
New upstream versions of distribute (0.6.46) and virtualenvwrapper (4.0).
upgrade to distribute 0.6.49

fixes #32
Merge pull request #33 from brainsik/distribute-0.6.49

upgrade to distribute 0.6.49
Unset default --prefix for setup.py install

This apparently fixes installation on Mac OSX Mountain Lion, where
installation of virtualenv failed with

    error: must supply either home or prefix/exec-prefix -- not both
upgrade to virtualenvwrapper 4.1.1
Revert "upgrade to virtualenvwrapper 4.1.1"

This reverts commit ba8239d6496129c71062445017a3b40c15473610.
upgrade virtualenv to latest version (1.10.1)
Latest upstream virtualenvwrapper
Install virtualenv-clone as well to guarantee it's available for virtualenvwrapper
Also install stevedore package from virtualenvwrapper
alright, install pip
Drop virtualenv-clone and stevedore. Let virtualenvwrapper install these on its own.
Revert "Drop virtualenv-clone and stevedore. Let virtualenvwrapper install these on its own."

This reverts commit 873a68f119ebcab89b6e8c020c1d0b2ab5dfd8c6.
Merge pull request #35 from martijnvermaat/unset-install-prefix

Unset default --prefix for setup.py install
We should load virtualenv-burrito startup script first. If the user activates a virtualenv in .bashrc then deactivation will forget all the virtualenv-burrito environment settings due to the way that virtualenv restores the environment on deactivation.
Merge @captnswing proxy support changes.
simplify the proxy code (urllib2 does the right thing by default) and don't use the with statement (for now)