first cut at relative template loading
formalize the asset loading for relative paths
fix bug loading assets relative to __main__
drop unused pyramid.asset function
add tests and cleanup relative asset loading
docs formatting
omg docs
Merge branch 'feature.lazy-loading' into feature.renderer-relative-paths
Merge branch 'master' into feature.renderer-relative-paths

Conflicts:
	CHANGES.txt
Merge branch 'feature.renderer-relative-paths'

This adds relative rendering to pyramid_mako. This also adds the ability
to override assets using Pyramid's powerful asset management system to
override various assets.

It is recommended to use this over using mako.directories as a setting.

Close #10
Change unreleased to next release