added details for SublimeText newbies, added directions for TextMate
added details for SublimeText newbies, added directions for TextMate

broadinstitute/wdl,openwdl/wdl,broadinstitute/wdl,broadinstitute/wdl,openwdl/wdl,openwdl/wdl,broadinstitute/wdl,openwdl/wdl