Update javascript to use custom zepto from Foundation

Foundation uses a custom version of zepto so we need to use it.
Also update to latest foundation version.
Update stylesheet and templates

Stylesheets update includes:
- Changing pygments class to default .codehilite
- Introduction of styles for new template components
- changing to a 16 column layout ( might revert back to 12 )
- reducing column gutter
Template work includes:
- removing extra ul from site_social
- adding creative commons handling to page_footer
- creating tags to display all tags with article counts
- adding the blogroll to base in aside
- starting work on tag