title: trouble with PIP and virtualenv
body: <p>Whenever i create a folder on my desktop and run "virtualenv venv" on terminal, everything works fine.  However when i try to create a folder in my "documents" folder and run "virtualenv venv" i get this error below?
  any suggestions why?</p>
  
  <pre><code>Andrews-MacBook-Pro:Python Virtualenv AndrewParkPhotography$ cd myproject
  Andrews-MacBook-Pro:myproject AndrewParkPhotography$ ls
  Andrews-MacBook-Pro:myproject AndrewParkPhotography$ virtualenv venv
  New python executable in venv/bin/python
  Installing setuptools............done.
  Installing pip...
    Error [Errno 2] No such file or directory while executing command /Users/AndrewParkPho...env/bin/easy_install /Library/Python/2.7/...pport/pip-1.1.tar.gz
  ...Installing pip...done.
  Traceback (most recent call last):
    File "/usr/local/bin/virtualenv", line 8, in &lt;module&gt;
      load_entry_point('virtualenv==1.7.1.2', 'console_scripts', 'virtualenv')()
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 928, in main
      never_download=options.never_download)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 1042, in create_environment
      install_pip(py_executable, search_dirs=search_dirs, never_download=never_download)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 640, in install_pip
      filter_stdout=_filter_setup)
    File "/Library/Python/2.7/site-packages/virtualenv.py", line 966, in call_subprocess
      cwd=cwd, env=env)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 672, in __init__
      errread, errwrite)
    File "/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/subprocess.py", line 1202, in _execute_child
      raise child_exception
  OSError: [Errno 2] No such file or directory
  </code></pre>