Runnable on Windows

Using "File::NULL" instead of "/dev/null" makes this program usable in
Windows, too.  But, it only works from ruby 1.9.3 upwards.
Ruby script should work for Windows, too

Using "File::NULL" instead of "/dev/null" makes this program usable in
Windows, too.  But, it only works from ruby 1.9.3 upwards.
Merge branch 'master' of https://github.com/NgrNxk/vrome
Merge pull request #328 from NgrNxk/master

Ruby script can't be run in Windows