- Fixed for double quote.
- Improved catch behavior.
- Improved tests.
Conpensated the initializer and the terminator of the Winsock in vp_host_exists().
Lelated the issue #44.
Merge pull request #45 from AmaiSaeta/fix/vp_host_exists-missing-init-4-winsock

Conpensated the initializer and the terminator of the Winsock in vp_host_exists().