Mobile nav fixed.

Now shows links instead of 'undefined'.
Fixed GitHub jsonp call. Closed #1118
Merge pull request #1116 from peterboni/patch-1

Mobile nav fixed.
added config_tag plugin for integration of configuration into templates
Improved: config_tag plugin is much more flexible now and can be used by other plugins directly through the config_tag method
Added sass-globbing, allowing plugin stylesheets to be auto-imported from the assets/stylesheets/plugins directory
fixed addSidebarToggler where index and section were flip-flopped
Merge branch 'master' of git://github.com/imathis/octopress into source
Updating favicon