GH_7 - Refactor default.html

Refactor the default.html layout to make use of various _include files.
This will facilitate the generation of different layouts in the future.

See issue : https://github.com/Ippoippo/ippoippo.github.com_source/issues/7

Signed-off-by: Ippoippo <ippoippo_software@ippoippo.net>
Merge branch 'refs/heads/gh_issue7_refactor_default_html'