Update gtksharp3-porting-guide.md

Corrected typo "out in min_height"
Merge pull request #16 from residuum/patch-1

Update gtksharp3-porting-guide.md
Added note about self hosting the site to top of readme
Fixed formatting
Update gems
Fixed internal site links in older blog posts
Get rid of links to old Mono download site
Removed obsolete answer from FAQ

Fixes #17
Add link to tarballs to /download page
Fixed GTK# link in its first paragraph
Update 3.6.0.md

Implement Miguel's rewording, plus standardize bug close links and add some general grammar tweaks.
Merge pull request #19 from lextm/patch-1

Fixed GTK# link in its first paragraph
Merge pull request #20 from txdv/gh-pages

Linux documentation.