Date rendering unit tests in pages

Tests to ensure rendering dates in templates is working correctly.
Actually, I was running into invalid templates not giving warnings when
I was trying to render a date.
Code reorg, helpers.go has been decomposed.

It started with wanting to move templates in template bundles and the
rest followed.  I did my best to start grouping related functions
together, but there are some that I missed.  There is also the method
Urlize that seems to be a special function used in both worlds.  I'll
need to revisit this method.