Add configuration setting to set selion log file limits.

[mach6]

With the recent changes to SimpleLogger (which is used by SeLionLogger) 003b480 we have an opportunity to add a new configuration option that will control the log file limits. For example, we can now limit the number of log files and/or the size before rolling to a new file. We should define a default behavior, add it to our SeLionLoggerSettings, and give the user the ability to override the default behavior.

[ysecaran]

@mach6 : I am getting this done. Will send out a pull request after testing

[mach6]

This was fixed with #151