Support tags on Einhorn#log_debug
Tag more logging calls with :upgrade.

This propagates more information likely to be useful to a supervising
process logging the output of an upgrade.
Flush stdout after writing status messages.
Whitespace
Merge pull request #34 from stripe/richo-log-moar-things

more verbose logging on upgrade
Bump version
Modify thin example to use thin-attach_socket + EventMachine-LE

Also update the docs to point at those instead of our thin/EM patches.
Merge pull request #35 from ebroder/thin-attach-socket

Modify thin example to use thin-attach_socket + EventMachine-LE
Pass each child a unique index number.

This allows for running N differentiated children within an einhorn
supervisor.
Add a command to flat-out set the worker count.
rename set-workers to set_workers for consistency