use interpolation for rebinning
allow string interval spec
default fragment length is feature length
avoid name collision
bigwig adapter
require genomic signal 'kind'
bigwig and generic interval file support
do not use log scale by default for chipseq class
use pandas for results_table
numpydoc for sphinx
much simpler rebin (interpolate)
allow string coord
use new rebin
docstring edits
fixes to local coverage, to use new rebin
remove cython ext from setup.py
new clustered_sortind
autodocs fixes
local_coverage_bigwig fixes
specify scaling