Changed our nested query search logic to use straight-up edismax.

Ho-ly crap that was easy. THAT'S WHY WE REFACTOR STUFF EVERYBODY. THANK YOU AND GOOD NIGHT.
added backlinks_txt as a queryfield
removed boost queries and log views boost function
score at 690
score at 700
updated tests to accommodate edismax non-nested queries
update test name
Merge pull request #703 from Wikia/backlink-query

Major Search Querying Update