Merge pull request #6 from hintjens/master

Added RFC 22
Update README.md
Merge pull request #7 from hintjens/master

Added RFC 23
Merge pull request #8 from hintjens/master

Finished draft of ZMTP/2.1 and ZMTP-PLAIN mechanism
Merge pull request #9 from hintjens/master

ZMTP/3.0 raw spec
Merge pull request #10 from hintjens/master

Clarified some text
Merge pull request #11 from hintjens/master

Identity max 255 chars
Merge pull request #12 from hintjens/master

Expanded ZMTP-PLAIN to make more explicit
Merge pull request #13 from hintjens/master

Added RFC 25
Merge pull request #14 from hintjens/master

Shortened mechanism names
Merge pull request #15 from hintjens/master

Revised draft of ZMTP/3.0
Merge pull request #16 from hintjens/master

Revised draft of ZMTP/3.0
Merge pull request #17 from hintjens/master

Finished draft of ZMTP 3.0
Merge pull request #18 from hintjens/master

Started on CurveZMQ specs
Merge pull request #19 from hintjens/master

Various RFC fixes
Merge pull request #20 from hintjens/master

Fixes to ZMTP RFCs
Merge pull request #21 from hintjens/master

Updated RFCs
Merge pull request #22 from hintjens/master

Added protocol examples
Merge pull request #23 from hintjens/master

Changed command names to be length+name
add zhttp spec