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

`-h` prints help. 
Clockwork runs as daemon if `-d` specified or the legacy way.

Legacy way;
`clockwork clock.rb`
No daemonize

Daemon way:
`clockwork -d -f clock.rb start`
`clockwork -d status`
`clockwork -d stop`
(uses deamon gem options, so pid might be specified)

`clockwork -v` to prints version number from `version.rb`

`clockwork -h` prints out:

    Usage:clockwork <clock.rb>
        or
        clockwork --daemon [options] start|stop|restart|run
    
    -d, --daemon                     Daemonize clockwork.
        --pid-dir=dir                Alternate directory in which to store the process ids.
    -i, --identifier=str             An identifier for the process.
    -l, --log                        Redirect both STDOUT and STDERR to a logfile named clockwork[.identifier].output in the pid-file directory.
        --log-dir                    A specific directory to put the log files into (default location is pid directory).
    -m, --monitor                    Start monitor process.
    -f, --file=<clock.rb>            Clock file (only required when run with 'start').
    -h, --help                       Show this message
    -v, --version