test RNA-seq speed in bisulfite-seq branch

[hxin]

Data.Name	Sargasso.Strategy	difference	bisulfite	master
rna_mouse_10	best	00:00:11	bisulfite_seq=00:13:30	master=00:13:41
rna_mouse_10	conservative	-0.0002315	bisulfite_seq=00:12:03	master=00:11:43
rna_mouse_10	permissive	-0.0002894	bisulfite_seq=00:14:05	master=00:13:40
rna_mouse_10	recall	-0.0002778	bisulfite_seq=00:14:00	master=00:13:36
rna_human_2	best	-0.0002083	bisulfite_seq=00:15:33	master=00:15:15

[hxin]

No difference in time, as expected. @lweasel

[hxin]

Well, a 10+ seconds delay may be caused by refactoring the namedtuple threshold data into a class, so an extra object is created when checking the threshold.