Support PyInstaller .exe files

PyInstaller .exe files gather together the relevant python interpreter and all needed libraries to create a Windows executable that doesn't require the end user to have Python separately installed on their system.

This issue is somewhat related to #307, in that PyInstaller files contain .pyz archives. The [PyInstaller Exctractor project](http://sourceforge.net/projects/pyinstallerextractor/) shows how to extract the contents of the PyInstaller file.

PyInstaller files _never_ contain source code, i.e., only .pyc and .pyo files. See, e.g., the [PyInstaller manual](https://pythonhosted.org/PyInstaller/#hiding-the-source-code). This means it would be necessary to invoke a disassembler or decompiler for analysis.