pass mongo options to EvidenceFacets initializer
pass mongo options to EvidenceFacets initializer

refs #93

OpenBEL/openbel-api,OpenBEL/openbel-api,nbargnesi/openbel-server,nbargnesi/openbel-server,OpenBEL/openbel-api,OpenBEL/openbel-server,OpenBEL/openbel-server,nbargnesi/openbel-server,OpenBEL/openbel-server,OpenBEL/openbel-api