Merge particles submodule into master.

.gitmodules

matlab/dynare_config.m

matlab/nonlinear-filters/auxiliary_initialization.m

matlab/nonlinear-filters/auxiliary_particle_filter.m

matlab/nonlinear-filters/conditional_filter_proposal.m

matlab/nonlinear-filters/conditional_particle_filter.m

matlab/nonlinear-filters/fit_gaussian_mixture.m

matlab/nonlinear-filters/gaussian_densities.m

matlab/nonlinear-filters/gaussian_filter.m

matlab/nonlinear-filters/gaussian_filter_bank.m

matlab/nonlinear-filters/gaussian_mixture_densities.m

matlab/nonlinear-filters/gaussian_mixture_filter.m

matlab/nonlinear-filters/gaussian_mixture_filter_bank.m

matlab/nonlinear-filters/importance_sampling.m

matlab/nonlinear-filters/measurement_equations.m

matlab/nonlinear-filters/multivariate_smooth_resampling.m

matlab/nonlinear-filters/mykmeans.m

matlab/nonlinear-filters/neff.m

matlab/nonlinear-filters/nonlinear_kalman_filter.m

matlab/nonlinear-filters/online_auxiliary_filter.m