Updated license to match busybox.
Add headers to compile correctly on a stricter (4.8.3) compiler.
Update license heading
Added command line options.
+ Added option to request current active log file name. Useful for starting
syslog.
+ Added error handeling for rotating a file that doesn't exist.
+ Added zero-padding of file names to names sort nicely.
+ Added command line options.
+ Added option to strip out a pattern from the filenames.