TRIBS-154 AAC Add judge name filter to search

TRIBS-154 AAC Add test for judge name filter

TRIBS-154 AAC Add subcategory filter to search and test
Rename AAC categories and subcategories models to match other tribs.
Use generic helper for AAC
AAC filter by subcategories
Fix AacSubcategory model. Add filter for Categories.

AAC add specs for filters

AAC extend full text search to judges table
AAC Use separate search_text field to store all concatenated searchable text.
Highlight metadata matches in search results
Fix parties and categories display on index pages
Merge pull request #99 from ministryofjustice/aac-search

TRIBS-134 Re-do Aac search using new search_text field