Merging in model & data exploration thus far

[jburos]

This includes following items:

• EDA of RNA-seq data
• Simulation of RNA-seq data
• Preliminary modeling at various levels of hierarchy
  • T cells vs B cells
  • Cell type (CD4+, CD8+, B cell)
  • Subset with exchangeable correlation (in progress)
  • Subset where correlation informed by cell-surface expression of markers (in progress)