move 'delete no-global-site-packages.txt' to the end of install_python
remove special case for user_dir on win32 platform
fix update_defaults for options with 'store_false' action

these need to revert the logic, otherwise calling virtualenv with
VIRTUALENV_NO_SITE_PACKAGES=1 set, will create a virtualenv *with*
site packages.

also adds a test
Merge branch 'fix-update-defaults' of https://github.com/schmir/virtualenv into schmir-fix-update-defaults

Conflicts:
	tests/test_virtualenv.py
Merge pull request #269 from dholth/develop

move 'delete no-global-site-packages.txt' to the end of install_python
Merge branch 'develop' of https://github.com/alexandrul/virtualenv into alexandrul-develop

Conflicts:
	virtualenv.py
Updated embedded pip to 1.2.
Rebuild virtualenv.py.
Removed mentioning Python 2.4.
Bumped version to 1.8 and updated changelog.
Merge branch 'release/1.8'
Merge branch 'release/1.8' into develop
Unset __PYENV_LAUNCHER__ for frameworks.

Fixes #322
Filter __PYVENV_LAUNCHER__ from subprocess.

Fixes #322 on OS X Framework installs.
Updates virtualenv.py to distribute-0.6.28.tar.gz

This matches the virtualenv_support
Merge pull request #325 from michr/develop

Updates virtualenv.py to distribute-0.6.28.tar.gz
Update news.
Merge pull request #323 from pnasrat/develop

Unset __PYENV_LAUNCHER__ for frameworks.
Use a glob pattern for discovering the distribute and setuptools file name.
Updated changelog and bumped version.