Matthew Aburn

Although `scipy.integrate.odeint` does not support that sort of thing. But hey, why not? This would then be an improved fix for mattja/nsim#2 , since it's reasonable for people to supply...

sdeint needs some tighter input validation, if people try to use a state vector y with shape (n,1) instead of (n,) e.g. mattja/nsim#2 I see that `scipy.integrate.odeint` also refuses this...