use nfbins (finer bins) in draw_ulh
Add BlindFunc to hide certain parameter's value.
Add test BlindFunc shift; fix bug in draw_ulh when nfbins not equal to bins.
update test_blindfunc(); somehow C compiler complains about closures inside cdef functions not yet supported; use regular python here.
Pass axis to plotting functions. Optional grid.
Merge pull request #35 from gitcheng/master

Add BlindFunc to hide certain parameter's value