Add a .gitattributes file to handle Unix files on Windows

We like to keep the LF line endings, instead of changing to CRLF
Change file after uploading from a Windows hosts to LF

We have to change the line endings from CRLF to LF, just removing all
CR characters.  If you don't do that, the IPv4 address will not set for
the network interfaces.
Update override-plugin.rb

With "temp.binmode" the file is written in LF only mode, even on a Windows host. That's all, no "tr" command is needed.
Fixed typo in .gitattributes
Merge pull request #87 from DieterReuter/windows-crlf

Mods for using on a Windows host, use LF instead of CRLF line ending