Facet widget and additional Wordpress Integrations

Added a sidebar widget that displays taxonomy facet filters as checkboxes, dropdowns, multi-selects, radios, or sliders, with options to display count dynamically (from Elasticsearch), as unchanging total (from MySQL), or not at all. Also option to submit with ajax. Options for the facet widget are included both in the Fantastic Elasticsearch admin section , as well as on the widget's admin. 

Also added to the NHP Options framework so that Elasticsearch can be added to any archive or page. This way, Elasticsearch can power loops and the facet widget on any part of the site (except posts, which could be easily added). Recently, the Lucene-Solr community has mentioned that Lucene-based search engines could function as NoSQL databases. For larger Wordpress installations, enabling Elasticsearch on all parts of the site, and thereby bypassing MySQL, may boost performance?