Add OS version detection support

[dmlloyd]

For OSes where the version is reliably detectable, we should try to detect the kernel version, distribution name, and distribution version.

See also this related discussion on another project.

[gastaldi]

This may also help:

https://github.com/trustin/os-maven-plugin/blob/os-maven-plugin-1.7.0/src/main/java/kr/motd/maven/os/Detector.java