update to use selmer instead of clabango
fix some html being escaped
update selmer version
update (simplify) view filters. add "is-empty" filter
use "is-empty" filter in views to catch empty collections (existing way didn't work anyway)
fix escaping tag json output
configuration file getter changes. toggle selmer caching off if in "development environment"
default config file is set to development environment
update selmer version (now supports nested for tags)
minor and mostly unnecessary code cleanups