replaced GNU octave syntax if (a!=b) with if (a~=b), for Matlab compatibility
Slight syntax change for plot title for MatLab compatibility
Fixed problem passing array of parmeters to a function in doForwardEuler
(needed to convert to cell array)
Fixed off-by one n doForwardEuler (time steps between b and a is (b-a+1))

Added ode45 solver to autoreg for comparison with my forward euler,
and added title and axes to plot.