MSVC correction for windows

Fixed `shared/refactor-integration` branch to ensure of correct compile, passing tests and integration tests. following [PR](https://github.com/apiaryio/markdown-parser/pull/4#issuecomment-49842166) on [`markdown-parser`](https://github.com/apiaryio/markdown-parser) and changes in [`snowcrash.gyp`](https://github.com/alikh31/snowcrash/blob/4f8669f9e3c301048d17969bcb8c8339827d8e2b/snowcrash.gyp).

cc. @zdne