Initial skeleton for v1.3.0. Currently contains the Message_type enum and the Hello message.
Merge branch 'master' into akron/v1.3.0
Added v1.1 and v1.2 directories with some stubbed out message.* files. Also updated the Message_type enum names to reflect v1.0's.
Printing facilities for sockets.

- Provide a port accessor for the address class.
- Implement a missing accessor.
Adding blocking flags for resources.
Adding non-member fns for resource flags.
Support incomplete system calls.
Add write events to the reactor.
Merge remote-tracking branch 'origin/akron/v1.3.0'
Fix Mac OS X build error.
Added flag structure to store command line flags
Added vocab.md and design.md. Began initial work on vocab.md