updated centos init script with latest generic-init logic from same branch; some commands don't work yet and will be fixed in subsequent commits
daemonizing tutorial includes a brief paragraph about centos
Eventloop: Connection errors in timers should propagate
better (and prettier) use of service functions
replaced tabs with spaces
Forgot to commit
Jython fixes.  Closes celery/billiard#38
generic init script now performs status check by verifying whether pids from pid files are running; also exits with appropriate exit status depending on whether commands succeeded or not
Support group with a single task.  Closes #1219
iter_native now works with empty result set.  Closes #1219
removed unused var CELERYCTL
Fix confusing beat examples.  Closes #1027
Fixes compatibility with pycallgraph.  Closes #1051
Cache Backend: Fixes chord support.  Closes #1094
multiple node support for centos script
minor refactoring and bugfixes
using "kill -0" instead of "ps h"; avoiding "$?" because of "sh -e"; minor refactoring
Disable amqp heartbeats by default
flakes
Better chord unlock error handling for kvstores