As discussed in Distributing a Merb application as a Gem, this patch adds configuration options to set the pid and log file paths. This is against r1126.
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-m, --merb-root MERB_ROOT The path to the MERB_ROOT for the app you want to run (default is current working dir).
-P, --pid-file PID_FILE The path to the pid file. __PORT__ will be replaced with the port (default is current working dir + 'pid/merb.__PORT__.pid').
-L, --log-file LOG_FILE The path to the log file. __PORT__ will be replaced with the port (default is current working dir + 'log/merb.__PORT__.log').
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