Update elasticsearch.php - added elasticsearch_nhp_options_section_setup and elasticsearch_nhp_options_args_setup filters.

We're writing an extension to your plugin which allows us to add custom fields to the index as well as set up custom 'search widgets' on specific fields. Originally our plugin had a separate nhp options section in the back-end, but we found we could integrate with your plugin back-end interface directly by adding the filters
elasticsearch_nhp_options_section_setup
and
elasticsearch_nhp_options_args_setup
removed purl, had memory problems
fixed permalink bug with category hooks, removed purl due to memory problems, started ajax support for widgets
simple ajax implementation that replaces buffered content with settings in widget
support for empty messages and deselecting with ajax
fixed tests, reenabling cats on faceting due to parent/child support
fixed short tag
fixes #47
Merge branch 'patch-1' of git://github.com/nielo/wordpress-fantastic-elasticsearch into nielo-patch-1
Merge branch 'nielo-patch-1' into 2.2.0
readme updates
small tweak
Updated subprojects
Add ability to set default option value
Set default option when retrieving enabled categories. Hides notice when retrieved null
Revert "Updated subprojects"

This reverts commit 841022a9aef2107456ad5c57e7da1ec0b0ed9228.
cleanup, better ajax widget parsing using css selectors, more page support for faceting
all tests pass, fixed ajax widget
see #49 - merged code and fixed tests so it works without ref
credits