Merge pull request #1658 from kamatari/fix-rake-clean

enable wildcard of rm_rf
Fix README to be more inline with my style

and remove stuff that is superfluous to my site.
Personalize _config.yml
Ignore the .ruby-version file
Add twitter and github info
Use .md instead of .markdown
Add basic theme
Add content from old site
Add trace build target
Replace default favicon with my ugly one
Fix post_url not working correctly