updated reservoir sampling script to produce multiple subsamples with -S; added docs
add epilog to sample-reads-randomly.py
updated ChangeLog for multiple subsamples with sample-reads-randomly
updated epilog docstring per @mr-c
removed SHELL setting in Makefile
added long-form options; fixed epilog crashing bug by adding metavar
pep8
include script in documentation
100% coverage
Merge pull request #197 from ged-lab/reservoir_sampling2

updated reservoir sampling script to produce multiple subsamples