Enable CoreOS support again now that root partition can be written to
Merge pull request #62 from jperville/reenable-coreos-support

Enable CoreOS support again now that root partition can be written to
Adding ability for VAGRANT_WIN_* proxy environment variables to be passed on to Windows hosts as proxies
Adding NO_PROXY capability
Added Windows capability
Added Windows docs
Merge branch 'windows-proxy' of https://github.com/ComparetheMarket/vagrant-proxyconf into windows-proxy