Merge pull request #465 from luixxiul/ui

ogp and twittercards updated
image added etc
sitemap.xml in robots.txt
aristoteles politics rewritten & tag added
jaspers excerpt rewritten & sitemap license deed.en added
update to jekyll 1.4.0
jaspers minor modified
twittercards username changed
sharebuttons twitter username
twitter username into variable in _config.yml
jekyll version
link added, jaspers rewritten
typo
images shrinked, smith rewritten
icon changed
mill image changed
bump
bump
jekyll original logo
image shrinked