Merge pull request #3 from michaelsanford/master

Darwin (Mac) uses the same vboxmanage syntax as linux
0.0.5
- Automatically detect host and guest OS
- Added Windows host support (Fixes #4)
- Added more VM power states (Fixes #5) and related tests
- vmExec() adapts to guest OS (Fixes #6)
- Check for reset/savestate VM before throwing error (Fixes #7)
- jshint and strict mode (Fixes #8)
Very presumptuously update package.json:
- Bump version
- Add contributors (src: github pull log)
- Add "npm test" action (Relates #8)
- Add node-unit devDependency (for later)