Changes

* Out-of-the-box [https://wiki.postgresql.org/images/6/6c/Index_support_for_regular_expression_search.pdf crazy-smart extraction of trigrams from regexes] (see page 49), comparable to Google Code Search. We'd have to do this in Python (which could be fun) to use ES. Keep in mind that [http://www.postgresql.org/message-id/19399.1299858408@sss.pgh.pa.us pg_trgm's idea of trigrams is, like trilite's, 3 bytes], not 3 chars.