made `clockwork -h` works. Usage is now like `clock <clock.rb> or clockwork --daemon [options] start|stop|restart|run`
version.rb removed, gemspec back to original.
bin/clockwork back to original
bin/clockworkd added to run Clockwork as daemon
clock file is loaded inside daemon. --clock=FIlE is required. We cheeck file exists
error send to stderr. typo fixed. clockword use in process name. file name used as default for identifier. default pid dir set to ./tmp/. print message wth pid dir and log dir.
bug fixed: --log-dir was not working. Now it can logs the output to specified directory
Merge pull request #22 from fddayan/master

Daemon arguments made available not requierning '-d'. Also, version.rb added.