Set the Linaro github account in config

Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>

_config.yml

@@ -25,7 +25,7 @@ description: >- # this means to ignore newlines until "baseurl:"
 baseurl: "/msm" # the subpath of your site, e.g. /blog
 url: "" # the base hostname & protocol for your site, e.g. http://example.com
 #twitter_username: jekyllrb
-#github_username:  jekyll
+github_username:  Linaro
 
 # Build settings
 theme: minima