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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

fixes #104

make suggested changes, pre-compute garlicBase64Encoding, simplify garlicValidate, check length of bytes

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

Opinionated: Paths should start with /, dammit!

This is a huge performance hit. Really, we just need to tell users not to modify
the result.

Also, get rid of an unnecessary pointer indirection (no api change).

fixes part one of #77

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