virtualenv.vim properly activate virtualenv

gistfile1.sh

[baba@bbair2012 ~]$ mkvirtualenv --python=python2.6 --no-site-packages sandbox2.6
Running virtualenv with interpreter /usr/local/bin/python2.6
New python executable in sandbox2.6/bin/python2.6
Also creating executable in sandbox2.6/bin/python
Installing setuptools............................done.
Installing pip...............done.
(sandbox2.6)[baba@bbair2012 ~]$ /usr/bin/python -V
Python 2.7.2
(sandbox2.6)[baba@bbair2012 ~]$ python -V
Python 2.6.8
(sandbox2.6)[baba@bbair2012 ~]$ vim -c "set filetype=python" -c "python import sys;print sys.version;print sys.executable;print sys.path"
2.7.2 (default, Oct 11 2012, 20:14:37)
[GCC 4.2.1 Compatible Apple Clang 4.0 (tags/Apple/clang-418.0.60)]
/Users/baba/.virtualenvs/sandbox2.6/bin/python
['/Users/baba/Dropbox/home/.vim/bundle/jedi-vim/jedi', '/Users/baba/.virtualenvs/sandbox2.6/lib/pytho
n2.7/site-packages', '/Users/baba/.virtualenvs/sandbox2.6', '/Library/Python/2.7/site-packages/pip-1.
2.1-py2.7.egg', '/Library/Python/2.7/site-packages/xhtml2pdf-0.0.4-py2.7.egg', '/Library/Python/2.7/s
ite-packages/markdown2-2.1.0-py2.7.egg', '/Library/Python/2.7/site-packages/pyPdf-1.13-py2.7.egg', '/
Library/Python/2.7/site-packages/html5lib-0.95-py2.7.egg', '/Library/Python/2.7/site-packages/readlin
e-6.2.4.1-py2.7-macosx-10.7-intel.egg', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib
/python27.zip', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Li
brary/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Framework
s/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework
/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framewor
k/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/pyth
on2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/Sy
stem/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/System/Library/Fr
ameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC', '/Library/Python/2.7/site-packages'
, '/Library/Python/2.7/site-packages/PIL', '/Library/Python/2.7/site-packages/setuptools-0.6c11-py2.7
.egg-info', '/Users/baba/.virtualenvs/sandbox2.6/lib/python2.7/site-packages']