snpeff annotation switch to use GRCh37 and GRCh38 reference genomes

[newgene]

Currently, we use "hg19" and "hg38" reference genomes (from UCSC) to produce snpeff annotations. The result misses "gene_id" field (the value is the same as "gene_name"). We can switch to use GRCh37 and GRCh38 reference genomes available here:

https://sourceforge.net/projects/snpeff/files/databases/v4_3/

Also we could upgrade the snpeff version we used too.

[newgene]

see also #112