BACKWARDS INCOMPATIBLE Dropped support for Python 2.5. The minimum supported Python version is now Python 2.6.
BACKWARDS INCOMPATIBLE Using virtualenv.py as an isolated script (i.e. without an associated virtualenv_support directory) is no longer supported for security reasons and will fail with an error.
Along with this, --never-download is now always pinned to True, and is only being maintained in the short term for backward compatibility (Pull #412).
IMPORTANT Switched to the new setuptools (v0.9.7) which has been merged with Distribute again and works for Python 2 and 3 with one codebase. The --distribute and --setuptools options are now no-op.
Updated to pip 1.4.
Added support for PyPy3k
Added the option to use a version number with the -p option to get the system copy of that Python version (Windows only)
Removed embedded ez_setup.py, distribute_setup.py and distribute_from_egg.py files as part of switching to merged setuptools.
Fixed --relocatable to work better on Windows.
Fixed issue with readline on Windows.
Fixed packaging of the library.
Initial release. Everything is changed and new!