bootCIFoldChange: Get bootstrap confidence intervals for fold change
In bramburger/colvano: Provide Intervals for Volcano Plots

This function calculates bootstrap confidence intervals for the fold change.

1 2	bootCIFoldChange(data, strata, protein.names, R = 999, int.width = 0.95)

`data`	data.frame, matrix or similar containing only the data to be used to calculate fold changes. (no protein names, etc)
`strata`	vector or factor containing the indices for the groups. For example, if the first three samples are case and the other three samples are control, `c(1,1,1,2,2,2)`
`protein.names`	a vector containing the names of the proteins. Should be the same length as the number of rows in `data`
`R`	the number of bootstrap replicates to perform
`int.width`	the required width of the interval