Release 3.2.0 checklist

Created by: dilawar

• SBML support
• Test GUI
• Tests for rdesigneur
• wheels.
• Travis passing moose-core, moose-gui and moose-examples
• Repo https://github.com/BhallaLab/moose has subtrees pulled to specific branch.
• Repo https://github.com/BhallaLab/moose-package has subtree pulled to specific branch.
• OBS builds are passing with draft branch.
• If everything is OK, tag branches and release on github.
• python wheel on windows (optional) Related to #176
• Documentation update. - Docker instructions (https://github.com/BhallaLab/moose/issues/245)
• Whether to make wheels as primary source of distributions?
• NeuroML2 support