Gene mutation script

This script is downloading gene mutations for selected tissue from CosmicDB. After downloading CSV files with samples and gene mutations, it changes FASTA sequence of gene with top 10 mutations.

CosmicDB allows download of already filtered gene mutations for specific tissue, unlike gene expressions which have to be filtered for selected tissue in VINI.

getGeneMutations method is trying with 10 attempts to download mutations from CosmicDB. Sometimes CosmicDB randomly responds with 401(unauthorized) response code, so script sleeps for 2sec and tries again with download request.