Making Thin startup win compatible

---max--conns isn't compatible with Windows in Thin. Using `Gem.win_platform?` To detect windows and avoid --max-conns if necessary. I figured using the Gem library was okay since Volt also has a bundler dependency, which depends on, and expects gems. It was the most reliable way I could think of to get Windows detection accurately and easily.
Merge pull request #67 from ryancastro/patch-1

Making Thin startup win compatible