Lazy Load update

_app.require added
- supports extensions and template files
_app.couple added
_app.extend added (for _app.require syntax)
new showContent with arbitrary pageType
quickstart addPageHandler coupler added
app templates factored into templates.html
pageHandler for product pages finished

TODO:
add the rest of the page handlers
ensure async support for all extensions
add requires to delegated event handling
add passive loading
product code cleanup
change to load event for faster init
logging cleanup
Homepage and Category Page worked through
hashbang -> query conversion
more hashbangs
Static pages (filter)
code cleanup
store_product _require safe
store_navcats _require safe
Search Pages added, store_search _require safe
404 page added
coupling timing update
Prevent crawling
post-load coupling change
contentBG fix
prevent navigating to the same page
about us vanity url, static page
other company pages added, cleanup