Parsing of time-dependent data, plot overload

[jkosata]

• transform_solutions works with time-dependent solutions (closes Transform solutions doesn't work for time-dependent solutions #21 )

• plot is now multiple-dispatched to avoid having to call plot_1D_solutions etc. Syntax remains plot(::Result, ::String, ::String)

• Plotting works for time-dependent solutions, syntax plot(::OrdinaryDiffEq.ODECompositeSolution, ::String, ::HarmonicEquation). The last argument is necessary because the time-dependent output of DifferentialEquations does not have info on which variable is which.

• ODEProblem takes general kwargs (closes Allow keyword arguments in the interface with DifferentialEquations.jl #30 )

• bugfix: Jacobian=false now correctly ignores the Jacobian in Problem