Init Origo with a mapState

[jokd]

Is your feature request related to a problem? Please describe.
It is useful to be able to add a mapState-parameter in the init params instead of adding a hash to the URL.

Describe the solution you'd like

Configured like this:
  var origo = Origo('index.json', {
    mapState: {
    "layers": [
        "osm/v/1/s/0/o/100",
        "origo-mask/v/1/s/0/o/25",
        "origo-cities/v/1/s/0/o/100"
    ],
    "center": "1810000,8390000",
    "zoom": "8.7",
    "legend": "expanded",
    "map": "index"
    }
  });

Describe alternatives you've considered
Use the available functionlaity with hash or mapState but they both have their drawbacks for this application