Allows plotting of heatmap without row annotations in y argument.
closes #10
Filters the metadata to match the output data at the end of a compass run. Ensures consistent row annotations.
Filtering is done based on individual_id (rownames of n_s)
and on the treatment group.
If subsetting has been done, this should be reflected in the individual_id, and it seems subsetting already affects the metadata.

closes #9
merged Kevin's resolution to #10 with my own.
closes #9

Merge branch 'master' of github.com:RGLab/COMPASS

Conflicts:
	R/plotMeanGamma.R