###Release Notes
2.2.1 Fixing bug in community model merging app.
2.2.0 Implementing support for drain flux list. Fixing bug in model merging code and in metagenome modeling pipeline.
2.1.0 Improving fba_tools to ensure MS2 models will run properly. Adding messages to build model and gapfill apps indicating they are obsolete. Fixing problem in reference chains in an ID contains a /.
2.0.0 Second release of KBase modeling tools.
1.7.7 Added KBase paper citation in PLOS format to utilities, added citations to Gapfill Metabolic Model, and created RELEASE_NOTES.md file