Implement post_quant_analysis

[Lioscro]

Implement post_quant_analysis for 1-factor designs.

Scripts for 2-factor designs are not yet implemented but should include:

1. Summary of DE genes in each factor and interaction
2. Pairwise correlation plots with Orthogonal Regressions.
3. Transcriptome-wide epistasis plot
4. Batesonian Comparison plot

@dangeles