Change the metadata object from a Magic_Anything to a straight dict

Lose the magic! Lose the magic! (That is *so* not what Anna said.)
remove calls to soundcloud object attributes and twitter
Merge pull request #14 from Rosuav/serializable_metadata

Change the metadata object from a Magic_Anything to a straight dict
Fetch artist and title from PostgreSQL instead of using placeholders
Merge pull request #15 from Rosuav/more_info_from_db

Fetch artist and title from PostgreSQL instead of using placeholders