Added #EXT-X-PLAYLIST-TYPE to supported simple parameters. Modified behaviour so that if #EXT-X-MEDIA-SEQUENCE is set to 0 it is serialized.
Added tests for modified behaviour. Modified README.rst
Update README.rst
Added documentation for new playlist_type field.
Corrected media serialization in the EXT-X-STREAM-INF tag to expose a quoted-string value. See http://tools.ietf.org/html/draft-pantos-http-live-streaming-12#section-3.4.10 subsections: AUDIO, VIDEO, SUBTITLES.
Merge pull request #30 from cristina0botez/variant_playlist_type

Variant playlist type