v.1.2.1 
*fixed bug on 2 source plots


v1.2 
4/7/2011
* fixed bug when all text files are included in the model.
* fixed subsource estimation procedure.
* fixed group estimation procedure.
* updated posterior diet contribution plots to include group estimates.
* fixed 2 source mixture and estimation plots.
* cleaned up values of input data passed into run.jags
* cleaned up output variables returned from run.jags
* added vignette