Add test case for the following model

[hsauro]

Add a test case to test the following model. It currently crashes due to a bug in roadrunner. Issue submitted and allocated to Kyle.

import tellurium as te
import roadrunner

r = te.loada("""
J1:S1 -> S2; k1*S1;

   S1 = 1; k1 = 0.1;

""")

r.conservedMoietyAnalysis = True
m = r.simulate (0, 10, 100, ['time', "S2'"])

[kirichoi]

Wait until #325 is resolved

[luciansmith]

Given that S2 has no rate associated with it, since conserved moieties are on, I think this isn't a bug so much as it is a bad error message. This is now what you get when you run that program:

RuntimeError: No rate available for floating species S2: if conserved moieties are enabled, this species may be defined by an implied assignment rule instead, and its rate cannot be determined.

[luciansmith]

Closed with #837 for now.