Added support for playlist durations.
Created API to list tags and script to generate and update the database collection.
Created API to find playlists by tag.
Implemented tag search
Added navigation bar showing user name and number of points.
Added confirmation before deleting playlists for security.
Logout link now works
Implemented simple scoring after completing playlist.
Merge pull request #9 from PabloRomanH/dev

Playlist playing time, tag search, simple user scoring.