Make fixed-width bins based on given bin size.
     
    
    getBins(chrom.lengths = hg19_chrlength, binsize = 1e+06, chromosomes = NULL)
 
    
    Arguments
- chrom.lengths
- A named character vector with chromosome lengths. Names correspond to chromosomes. 
- binsize
- Size of bins in basepairs 
- chromosomes
- A subset of chromosomes for which the bins are generated. 
 
    
    Value
    A data frame with chr start and end positions