fix "space in app name" issue thanks to "Hoelter, Jake" <hoelterj@amazon.com>

> I recently pulled the code and used it, and discovered that it didn’t
> handle spaces in the CMake app install name (e.g. "CMake 2.8-12.app"),
> so I fixed that issue. Two small edits, patch attached. It allowed me
> to easily generate a 2.8.12.1 docset.
Merge branch 'hotfix/space_in_app_name'