fixed autoincerement DB schema, added custom ID
support for tracks without artist
Merge branch 'master' of github.com:aupeo/node-echoprint-server into aupeo-master

Conflicts:
	controllers/fingerprinter.js
	models/mysql.js
	mysql.sql
Merge branch 'aupeo-master'
ensure track and artist are optional
limit incoming request size
ensure custom_id is always returned on successful ingestion or query, remove seemingly duplicated artist creation block
remove unused sanity checks - a missing artist_id is valid for our use
remove commented code
Merge pull request #1 from sethhochberg/master

Selective pull of upstream code changes / integration work for AudioAddict