On branch temp

try to support both UCSC and ENSEMBL format of chrom (without the "chr" prefix)
not completely tested
On branch temp
data.py, utils.py: get_chrom_format(chrom) -> get_chrom_format(chroms)
instead of taking one chrom string, now takes a list of all the chroms
On branch temp
pyloh/preprocess/io.py: raise error if the ref feeded from command line is different from the bam files
Update README.md

update to 1.1.1