Addition of output wrapper functions

Added new CellNet output wrapper functions:
-plot_classification_hm()
-grn_status_by_CT()
-grn_status_by_dlevel()
-make_nis_plot()
-ordered_class_perf_hm()

Bioconductor dependencies automatically installed

CellNet RNA-Seq

This update includes pruning out unused functions, and a streamlined README

CellNet 0.1.0

Original RNA-seq CellNet release.

Radley, A.H., Schwab, R.M., Tan, Y., Kim, J., Lo, E.K.W., and Cahan, P. (2017). Assessment of engineered cells using CellNet and RNA-seq. Nature Protocols 12, 1089–1102.