Update to modSearchResults function

Previously, the modSearchResults function would return a vector called "BestMethod", but the model methods in this vector appeared in a random order, rather than ranked by their performance in accordance with the numeric stats returned in the "topMetric" vector. These updates to the modSearchResults function return top-performing models in the correct order, with the top-performing model appearing first in the list of models, and with each model method in the BestMethod vector corresponding to the values in the topMetric vector.  The use of ddply has been removed from the first pull request.