Add tags in the blog.

On branch master

	modified:   _layouts/post.html
	new file:   _layouts/tag.html
	new file:   _plugins/tagGenerator.rb
	modified:   blog/index.html
	new file:   blog/tag/aldebaran/index.html
	new file:   blog/tag/art-voeux/index.html
	new file:   blog/tag/blog/index.html
	new file:   blog/tag/book/index.html
	new file:   blog/tag/business/index.html
	new file:   blog/tag/development/index.html
	new file:   blog/tag/free-software/index.html
	new file:   blog/tag/free/index.html
	new file:   blog/tag/geek/index.html
	new file:   blog/tag/google/index.html
	new file:   blog/tag/hadopi/index.html
	new file:   blog/tag/hec/index.html
	new file:   blog/tag/iptv/index.html
	new file:   blog/tag/jekyll/index.html
	new file:   blog/tag/linux/index.html
	new file:   blog/tag/marketing/index.html
	new file:   blog/tag/nabaztag/index.html
	new file:   blog/tag/nao/index.html
	new file:   blog/tag/paristech/index.html
	new file:   blog/tag/rmll/index.html
	new file:   blog/tag/robotics/index.html
	new file:   blog/tag/ruby/index.html
	new file:   blog/tag/school/index.html
	new file:   blog/tag/symfony-live/index.html
	new file:   blog/tag/symfony/index.html
	new file:   blog/tag/ted/index.html
	new file:   blog/tag/telecom/index.html
	new file:   blog/tag/twitter/index.html
	new file:   blog/tag/useless/index.html
	new file:   blog/tag/videolan-devdays/index.html
	new file:   blog/tag/vlc/index.html