Allow disabling of URL Filters in ParseSegment

Right now, the ParseSegment job does not allow you to disable URL filtration. For reasons that aren't worth explaining, I need to do this, so I enabled this behavior through the use of a boolean configuration value "parse.filter.urls" which defaults to true.

I've attached a simple, preliminary patch that enables this behavior with that configuration option. I'm not sure if it should be made a command line option or not.