Modeler can serve itself

[DavidSouther]

The modeler should be installable with a single command, and another command can start it ready to store to itself.

[DavidSouther]

• Modeler is installable with npm npm install jefri-modeler
• Modeler can be started with a single command npm start
• The modeler's default PostStore URL is the server that it started from

[DavidSouther]

Closed in v1.0.0