split songs in one feature per artist

[titimoby]

No description provided.

[titimoby]

I have a shitty syntax error
Next time I'll branch and test before
do not Merge :)

[titimoby]

something is wrong in the dev env
I'm investigating something around :
thierry-laptop% ./bin/hubot
bob-the-bot> [dev mode 🐼]
[Fri Sep 09 2016 12:10:59 GMT+0200 (CEST)] INFO /home/thierry/projects/bob.the.bot/scripts/feature.42.js is using deprecated documentation syntax
💘 feature.joe.dassin loaded
[Fri Sep 09 2016 12:10:59 GMT+0200 (CEST)] INFO /home/thierry/projects/bob.the.bot/scripts/feature.joe.dassin.js is using deprecated documentation syntax
[Fri Sep 09 2016 12:10:59 GMT+0200 (CEST)] WARNING Loading scripts from hubot-scripts.json is deprecated and will be removed in 3.0 (github/hubot-scripts#1113) in favor of packages for each script.

Your hubot-scripts.json is empty, so you just need to remove it.
[Fri Sep 09 2016 12:10:59 GMT+0200 (CEST)] ERROR Error loading scripts from npm package - Error: Cannot find module 'hubot-heroku-keepalive'
at Function.Module._resolveFilename (module.js:440:15)
at Function.Module._load (module.js:388:25)
at Module.require (module.js:468:17)
at require (internal/module.js:20:19)
at Robot.loadExternalScripts (/home/thierry/projects/bob.the.bot/node_modules/hubot/src/robot.coffee:401:11, :272:27)
at /home/thierry/projects/bob.the.bot/node_modules/hubot/bin/hubot:152:11, :159:26
at FSReqWrap.readFileAfterClose as oncomplete