Change the YAML format to list of tracks
Implement HashWithIndifferentAccess on the side
I guess that's a typo
Update README.md
Merge pull request #15 from AgIt0/fix_typo

I guess that's a typo
Update README.md
Missed an S
Merge pull request #18 from AgIt0/fix_typo

Missed an S
Merge pull request #16 from svetliomihailov/patch-1

Update README.md
Merge pull request #17 from svetliomihailov/patch-2

added Should return a new Playlist. for a few methods
Merge branch 'master' of https://github.com/HackBulgaria/Core-Ruby-1
Update solutions