somewhat working date facet class
renamed the query var from date_range to date-range. also return the selected date range from parse_query() which's expected by Facets class
cache terms in found set
implemented a get_cache_key() function that takes into account the plugin version and whether scriblio-cachebuster is set or not
cleaned up post count logic and fixed an off-by-1 bug
comments
added a Facet widget sort order of "None" which will preserve the facet ordering as generated by the facet class and not be sorted by term counts or names. This is designed to be used by the Facet_Publish_Date class but may be useful elsewhere too.
spacing and comments
improved variable names
Merge pull request #52 from wluo/github-4087

Publish date facet