added updateQueue helper and implemented testDbHelpers.js
successfully implemented updateQueue Helper
Added add song(s) to Queue in dbHelpers.js
updated playlist response in api docs
updated api docs
cleaned up whitespace in models.js
deleted schema.js, migrated info to models.js
Cleaned up whitespace in models.js
Merge branch 'helpers' into dev
Merge pull request #9 from alexmckenley/dev

Merge helpers