cleaned up output from build32-debug.bat and build64-debug.bat
x64.props: don't blow away PythonExe variable if HOST_PYTHON environment variable is not set
This fixes 64-bit builds on machines where the HOST_PYTHON env var is not set
This change was adapted from the following:
    http://hg.python.org/cpython/rev/a9d4cf7d15b9
    http://bugs.python.org/issue15102
build64-debug.bat: fix final line that invokes python_d.exe
build_ssl.py: remove "ml64 -c -Foms\uptable.obj ms\uptable.asm" since it fails horribly and doesn't seem to adversely affect compilation
build64-debug.bat: set HOST_PYTHON to work around the buggy Visual Studio project configuration that cannot find the python_d.exe that it itself compiles
.gitignore: added 64-bit build artifacts