Bump version to 0.1.1-SNAPSHOT

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Implement the :array decoder

The :array decoder is very similar to :slice, but it returns a
byte-array instead of a ByteBuffer. While there, also turn :string
into a wrapper around :array.

This fixes #1.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>
Minor code cleanup

In the :prefixed decoder, don't use let to extract the length, wire it
into the decode-frame itself.

Signed-off-by: Gergely Nagy <algernon@madhouse-project.org>