(CFACT-141) Fix OS release fact on Windows

Updates the OS release fact on Windows to return the official release name
instead of the release code. Uses rules identical to Facter.
(maint) Skip libcurl on Solaris for now

For facter it's only used on linux (for query gce and ec2 metadata
endpoints), and we may be rolling our own libcurl as part of toolchain
work for Solaris, so we can sort this issue out later.
Merge pull request #199 from kylog/use-curl-only-on-linux-for-now

(maint) Skip libcurl on Solaris for now
Merge pull request #198 from puppetlabs/bug/master/CFACT-141-Windows-fix-OS-release

(CFACT-141) Fix OS release fact on Windows