Components take a map ctor the same way ports do.

We'll leave shards and connections alone for now.
Bump version.
Clean up spec fixtures.
More fixture cleanup.
Spec cleanup.
Improve log message.
Worker processes no longer die on SIGCHLD.

Workers were inheriting parent's SIGCHLD handler, so when they ran a
subshell for any reason, they died, which killed the whole kit and
caboodle.

Fixes #28.
Add starting log message.

Fixes #42.
Clarify ZeroMQ code.

ZMQ proxy refers to back and front in the reverse of how I had them named.
Fail when trying to create IPCs on NFS mounts.

Use Sys-Filesystem to check the fstype. If it's an NFS mount, a VMWare
virtual mount, or a VirtualBox virtual mount, complain instead of
proceeding, since IPCs created there will not work properly.