added -ic option to split_regex to ignore case when splitting
added -ic option to split_regex to ignore case when splitting

mcenirm/csvfix,mattgascoigne/csvfix,jheusser/csvfix,mcenirm/csvfix,mattgascoigne/csvfix,ausonweng/csvfix,mattgascoigne/csvfix,jheusser/csvfix,ausonweng/csvfix,mcenirm/csvfix,jheusser/csvfix,ausonweng/csvfix