Add links to user pages of Tumblr, Hatena Blog and Qiita to /index.html

and change labels slightly
Remove unnecessary line in .gitignore

This change should be in ed5a116ac496199653c78afcc226f1a3521f9b55.
bundle update, Add changelog to post pages
Use grit instead of Ruby/Git in git_log.rb

Directly parse output of `git log ...`
Ignore .bundle/
Add a post
Specify license of git_log.rb