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* Support 'DISTRIBUTE_DISABLE_VERSIONED_EASY_INSTALL_SCRIPT' environment
variable to allow to disable installation of easy_install-${version} script.
* Support Python >=3.1.4 and >=3.2.1.
* Distribute 204: Don't try to import the parent of a namespace package in
declare_namespace
* Distribute 196: Tolerate responses with multiple Content-Length headers
* Distribute 205: Sandboxing doesn't preserve working_set. Leads to setup_requires
problems.