* Don't install pre-release versions of pip, setuptools, or wheel from PyPI.
15.0.3
-------------------
* Test for given python path actually being an executable *file*, :issue:`939`
* Only search for copy actual existing Tcl/Tk directories (:pull:`937`)
* Generically search for correct Tcl/Tk version (:pull:`926`, :pull:`933`)
* Upgrade setuptools to 22.0.5
15.0.2
-------------------
* Copy Tcl/Tk libs on Windows to allow them to run, fixes :issue:`93` (:pull:`888`)
* Upgrade setuptools to 21.2.1.
* Upgrade pip to 8.1.2.
15.0.1
-------------------
* Print error message when DEST_DIR exists and is a file
* Upgrade setuptools to 20.3
* Upgrade pip to 8.1.1.
15.0.0
-------------------
* Remove the `virtualenv-N.N` script from the package; this can no longer be correctly created from a wheel installation. Resolves :issue:`851`, :issue:`692`
* Remove accidental runtime dependency on pip by extracting certificate in the subprocess.