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Add gemfile.lock
Fix CSS reference
Fix baseurl for the test
Play with urls.
Merge branch 'master' into gh-pages
Fix urls for gh-pages
Still fixing some url trouble.
Refer CSS & set base url properly following: http://jekyllrb.com/docs/github-pages/
Replace url by base url for going back to main page.
Fix image urls
Fix code background, make the page narrower.