fixed bug in current_song_for_index filter
removed fields of song in db schema
added split_artists custom validation function to custom.js in validations folder, added this custom function to validation of live, news, releases, videos
added validation rule for id, replaced args to send into model with req.form, removed, replaced body with ori_body when validation fail
added comments to callback in model call for describing the behavior of callbacks
use findByIdAndUpdate instead of find and save in Post model and Release model, added post save hooks of insert back to Post model and Release model
added back db schema for hooks
use regex to query in Release model
fixed field name in _fields.html partial of admin releases
added contents of Live model, removed useless field of live in db schema, added missing parts of admin live controller
minor modified naming of args variable in Live model, Post model and Release model
removed useless code Live model
added get_info_from_youtube filter for admin videos controller
added content to Video model and admin videos controller