Added more Scipy integrators to handle stiff problems #2880
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Currently there is only one scipy integrator classes that uses RK45. I created a general integrator class that uses RK45 by default called ScipyIntegrator, this is the parent class. Then, I created child classes that inherit from this class but pass different solvers. I added two more solvers currently not available, BDF and LSODA. These solvers work for stiff problems.