Changes for Windows Support

When running from git on windows, line-endings were not handled correctly and scripts from shared folders were failing when executed on the VMs.

I added gitattributes files so that the 12cR1 and stagefiles directories (which are shared with VMs) will always have unix-style line endings.  I made exceptions for the gitattributes files themselves and for the 12cR1/readme file.

With these changes it seems that I can now run the vagrantfile from a git checkout on windows.