move get_ensembl_gene and external_gene_id methods to EnsEMBL util module
move to a new dir structure
renamed base file to fit in with new directory structure
fixed packaged names
initial commit of test infrastructure, using Test::Class, ported old LIMS2::Util::EnsEMBL tests over
add tests for get_ensembl_gene and external_gene_id methods on the EnsEMBL util module