commented some example codes in monocle_wrapper, due to some unknow error.
updated according to bioCheck results for version 0.99.1.
updated according to first bioCheck results.
added the main function for uSORT named uSORT in file uSORT_main.R
added function uSORT_sorting_wrapper
added GUI function uSORT_GUI
structured all codes for preprocessing to file uSORT_preProcess.R
structured all codes for postprocessing to file uSORT_postProcess.R
structured all codes for gene selection to file uSORT_GeneSelection.R
added documentations for exported functions
added one vignettes for the package
added test code for the pacakge
added namespace and dependencies declarition