intervals and sites around SNV position
each_site --> .each_site.select(&:site_before_substitution?); each_mutated_site_info --> .each_site
refactor and improve SNV shuffling
rename cancer_SNPs.txt --> sites_cancer.txt; mutated_sites_shuffled.txt --> sites_random.txt for unification and clarification
move shuffle_SNVs.rb to bin/preparations
gitignore
filter out SNVs intersecting repeats
make use of interval_notation gem in promoter markup fixing
SNV markup refactor