1.0.0

CHANGES:

• Extract and expose Decoder.t, useful for "decoding" things outside of the JSON family (#40, @mattjbray).
• Add Decoders.Xml.S to decoders, create decoders-ezxmlm, and add Decoders_bs_xml to bs-decoders (#49, @mattjbray).
• BREAKING: namespace bs-decoders modules under Decoders. To upgrade,
  replace Decoders_bs with Decoders.Bs_json (#49, @mattjbray).
• Add decoders-jsonaf (#50, @dvmitrv).