version 1.6.0 (last update 2017-04-14)
    + Bioc release cleaned up documentation and debugging MgDb class definition with tree slot

version 1.5.1 (last update 2017-03-20)
    + editing documentation

version 1.1.3 (2016-10-01)
    + replaced msd16S with mock community dataset for examples
    + changed tree mgFeatures and MgDb slot from class phylo to phyloOrNULL

version 1.1.2: (2016-03-26)
    + Added mgFeatures class - this class replaces metagenomeAnnotation in the 16S workflow, and contains database information for a user provided list of database sequence ids. A new metagenomeAnnotation-class will be added to the package when a suitable R native 16S taxonomic classificaiton method is available.
    + new `aggregate_taxa` function for aggregating MRexperiment objects to user defined taxonomic level, aggretation of count data is performed using sums by dafault, users can pass any column wise matrix operation.

version 0.0.0.9 : (2015-09-14)
	+ Pre-Release Bioconductor
