Merge pull request #4 from yife/gh-pages

fix typo
wrote about OpenBSD
fix passive to active.
Merge branch 'gh-pages' of https://github.com/EzoeRyou/blog into gh-pages
wrote another article about heartbeat
update index.html
wrote about youkai network.
wrote about OpenBSD
wrote about GCC 4.9.
fix markup error.