updated roxumentation for various functions.
updated mixtureModelLogLikelihood plotting routine as well as .rda files.
created timing experiment to gauge effect of SGD on BFGS and CG run times.
cleaned up loglikelihoodSurface calculation script and brought default resolution down to 200x200.
cleaned up mixtureModel generation script as well as objective_functions script.
updated timing experiment to reflect re-organization of code and removed context() call in helper script.
cleaned up body of SGD.R