New version of virtualenv is available

[ryszard]

Namely, 1.6.1, and it works with PyPy. For the newest stable version of virtualenv, you may consider fetching it from pypi instead of GH.

[mpasternacki]

I prefer to specify a precise version of software I download to "just grab anything newest, I don't care". I prefer Github to pypi here, because I can download single file instead of whole tarball (I think pypi used to provide a single-file version to download, but now it doesn't). I've parametrized version of virtualenv to download (so user can override), and defaulted it to 1.6.1.

BTW, since virtualenv now uses git-flow, it's simple to specify "newest released" version when downloading from github - just use master branch instead of any specific tag.