Fixed comment spelling.
Issue #159: Enable setting PyQt4 API in 'qt4plugins' run-time hook.

Enable the user to configure which PyQt4 API version is used in the
'pyi_rth_qt4plugins' run-time hook by defining a 'PYQT_API_VERSION'
constant in a user provided 'pyi_rth_user_config' module.
Merge branch 'develop' of git://github.com/pmcnr/pyinstaller into develop