updated documentation on the format of the external_db file and how to use the update_external_dbs.pl script
updated documentation on the format of the external_db file and how to use the update_external_dbs.pl script

mjg17/ensembl,at7/ensembl,Ensembl/ensembl,james-monkeyshines/ensembl,james-monkeyshines/ensembl,willmclaren/ensembl,james-monkeyshines/ensembl,muffato/ensembl,danstaines/ensembl,Ensembl/ensembl,mjg17/ensembl,james-monkeyshines/ensembl,at7/ensembl,Ensembl/ensembl,at7/ensembl,muffato/ensembl,willmclaren/ensembl,danstaines/ensembl,muffato/ensembl,mjg17/ensembl,danstaines/ensembl,muffato/ensembl,at7/ensembl,Ensembl/ensembl,mjg17/ensembl