Warning Signals
 Bootstrapping for likelihood ratios!
 Updated class behavior  all simulation and fitting routines now return timeseries objects as data with correct range and timestep.
 updated plotting routines. Likelihood ratio plotting function. Bootstraps of parameters can be plotted using the output from the likelihood ratio fit simulation, avoiding redundancy, just specify which model is desired. Bootstrap likelihood ratio plots includes the original ratio and calculates plot range using this information.
 Warning signal model implementation needs to also receive the absolute time, and update alpha_0 as alpha_0 + beta*t
