theme: product page slider development
theme: enable OpenSans font (partial)
theme: add slider javascript
theme: product slides set max width
theme add 'full width' version of the design to the template

This is porting some of the parts from "[Full Width _s][fwu]".

[fwu]: http://sdavis2702.github.io/full-width_s/ "Full-width Underscores on Github"