fixed two broken tesets
changed occ2df to use rbind.fill to be able to smack together data.frames more safely, now fromimporting rbdind.fill from plyr
changed all outputs to have the same lat and lon var names, closes #91
fixed occ2sp fxn to remove NA rows
removed some old unneeded fxns
fixed bugs in occ_to_sp
improved docs for clean_spocc a bit, noted that its work in progress #44