GEMINI/vcfanno: generalize detection of hg19/GRCh37
GEMINI/vcfanno: generalize detection of hg19/GRCh37

Support non-standard bcbio genome installs that use hg19/GRCh37 contigs
and want to make use of GEMINI. Thanks to Moiz Bootwalla

https://groups.google.com/d/msg/biovalidation/6_qkQr3GU7Y/ud68VMZfAgAJ

lbeltrame/bcbio-nextgen,lbeltrame/bcbio-nextgen,chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen,lbeltrame/bcbio-nextgen,chapmanb/bcbio-nextgen,a113n/bcbio-nextgen,vladsaveliev/bcbio-nextgen,a113n/bcbio-nextgen,a113n/bcbio-nextgen,chapmanb/bcbio-nextgen,vladsaveliev/bcbio-nextgen