Update dependencies
Merge pull request #196 from wktk/update-dependencies

Update dependencies
fix broken spec in ruby 2.0.0-p195
Merge pull request #197 from 1syo/fix-broken-spec-in-2.0

Fix broken spec in ruby 2.0
Fix html escape bug at Themes
Merge pull request #198 from mizoR/master

Fix html escape bug at Themes
Merge pull request #199 from kmamiya/add_sitemap.xml

Add sitemap.xml.