GSE24314 lists SRX values as "relations".

[seandavi]

This is a mistake on the part of GEO, I think. Need to filter out anything that does not end in "P" for SRA study accession relationships.

ERROR:geo-to-postgresql:b'GSE24314'
ERROR:geo-to-postgresql:3 validation errors
sra_studies -> 1
  string does not match regex "[ESD]RP\d+" (type=value_error.str.regex; pattern=[ESD]RP\d+)
sra_studies -> 2
  string does not match regex "[ESD]RP\d+" (type=value_error.str.regex; pattern=[ESD]RP\d+)
sra_studies -> 3
  string does not match regex "[ESD]RP\d+" (type=value_error.str.regex; pattern=[ESD]RP\d+)