Dangling symlink on extract

[kylegibson]

This error occurs when terrarium is run using the python2.X binary instead of just python. because python2.X already exists in the bin directory as a symlink, the copy fails

Extracting terrarium bundle
/home/policystat/environments/997436eb9a2b5dd1e9f319ac0b7f9bc3/bin/python2.6 /home/policystat/env.LOwIni/bin
cp: not writing through dangling symlink `/home/policystat/env.LOwIni/bin/python2.6'
Traceback (most recent call last):
  File "/home/policystat/env/bin/terrarium", line 9, in <module>
    load_entry_point('terrarium==0.1.2dev', 'console_scripts', 'terrarium')()
  File "/home/policystat/environments/997436eb9a2b5dd1e9f319ac0b7f9bc3/src/terrarium/terrarium/terrarium.py", line 640, in main
    terrarium.install()
  File "/home/policystat/environments/997436eb9a2b5dd1e9f319ac0b7f9bc3/src/terrarium/terrarium/terrarium.py", line 105, in install
    downloaded = self.download(new_target)
  File "/home/policystat/environments/997436eb9a2b5dd1e9f319ac0b7f9bc3/src/terrarium/terrarium/terrarium.py", line 299, in download
    self.extract(archive, target)
  File "/home/policystat/environments/997436eb9a2b5dd1e9f319ac0b7f9bc3/src/terrarium/terrarium/terrarium.py", line 250, in extract
    call_subprocess(['cp', path_to_python, bin_dir])
  File "/home/policystat/environments/997436eb9a2b5dd1e9f319ac0b7f9bc3/lib/python2.6/site-packages/virtualenv.py", line 1020, in call_subprocess
    % (cmd_desc, proc.returncode))
OSError: Command cp /home/policystat/env...7f9bc3/bin/python2.6 /home/policystat/env.LOwIni/bin failed with error code 1