Make the header not jump around
Fix links to GitHub repo for spencerlyon2/hugo_gh_blog

Hello,

The `github_pages_blog.md` tutorial mentioned links to the git repository of "spencerlyon2/hugo_gh_blog" however it was linking to the page itself (i.e. http://spencerlyon2.github.io/hugo_gh_blog ).

This commit replace those links with links to https://github.com/spencerlyon2/hugo_gh_blog
Adding TechMadePlain to showcase

Thanks to Hugo I get to write all my posts in Markdown.
Allow to use filename in permalinks
Fix Viperized .Site.Params

git bisect identified 62dd1d4 as the breaking commit; when
github.com/spf13/viper was introduced, the Params field was always
empty.

Given a map in YAML in Viper, the return type is
`map[interface{}]interface{}`, _not_ `map[string]interface{}`, even if
`.SetDefault()` has been called with an item of
`map[string]interface{}{}` so the cast assertion on the `.Get("Params")`
always failed.
Simplifying the siteInfo handling
Fixed #301. LiveReload works on any port now.
SiteInfo is now a pointer on the Node
Include Section Taxonomy into SiteInfo

This allows to build more complex pages, like :
http://martinfowler.com/tags/