add leadership tracking
add a deadlock detection check in get_response
make #leader? wait for group join to complete
Fix race listening for command echo

There was a race condition when waiting for a command echo if a response is sent to another node where the execution id is the same as our echo's execution ID.
add RUBY_THREAD_MACHINE_STACK_SIZE to rake 'test' task
add rake 'release' task
Version: 0.0.2

* add rake 'release' task
  Patrick Hemmer (2013-11-09 21:07:23 -0500) - @d95ddd5

* add RUBY_THREAD_MACHINE_STACK_SIZE to rake 'test' task
  Patrick Hemmer (2013-11-09 20:50:17 -0500) - @e21a8fa

* Fix race listening for command echo
  Patrick Hemmer (2013-11-09 18:52:05 -0500) - @40de12a

* make #leader? wait for group join to complete
  Patrick Hemmer (2013-11-09 18:51:10 -0500) - @38c5f67

* add a deadlock detection check in get_response
  Patrick Hemmer (2013-11-09 00:57:02 -0500) - @44f4780

* add leadership tracking
  Patrick Hemmer (2013-11-09 00:48:13 -0500) - @fa7b498

* pass sender to callbacks and allow on_confchg callback
  Patrick Hemmer (2013-11-08 17:46:57 -0500) - @5edbb28

* fix typo in example
  Patrick Hemmer (2013-11-06 17:57:46 -0500) - @ccac2a5