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* Add support for ipcidr protocol

* Move test

* Fix gocheck

* PR comments

* Check byte slice len

Now that we define all protocols in this package, we might as well add wss.

fixes #72

This is a defacto standard and is used by js-libp2p.

Ported from https://github.com/multiformats/go-multiaddr-dns/pull/17.
This was decided in https://github.com/multiformats/multiaddr/issues/22.

move dns protocol definitions (https://github.com/multiformats/go-multiaddr-dns/blob/3974bf3f84c52825588fdcc0fd0e0aa7953ab5ff/dns.go#L11)

move ws protocol definitions (https://github.com/libp2p/go-ws-transport/blob/ec8d1818a2e6edad2496410cbc554df6fe930ea2/websocket.go#L23)

move protocol definitions (https://github.com/libp2p/go-libp2p-circuit/blob/master/transport.go#L13-L24)

add both base64 and base32 addresses as separate protocols, remove port from addresses to be expressed as /tcp, etc.

See [rfc4007].

Can be prefixed to "ip6" like so:

    /zone/eth0/ip6/fe80::1

This corresponds to the rfc4007 address `fe80::1%eth0`

[rfc4007] https://tools.ietf.org/html/rfc4007

Also use `AddProtocol` for *all* protocols (even predefined ones).

We were missing a logarithm... CodeToVarint would previously allocate
more bytes than necessary (exponentially) for the varint slice. This bug
was silent but deserves to be fixed nonetheless.

It conflicted with CBOR.

part of multiformats/multicodec#55

1. Swap udt/utp.
2. Fix udp (17 is SHA1)
3. Change them to hex so it's easier to compare them with the official
   multicodec table.
4. Remove the local protocols.csv table.

Fixes #49
Fixes multiformats/multicodec#51

Allowing multiaddr extensions to have data with