Buildout tests for gist / url loading

[alukach]

A series of tests to accompany #130.

Finally feeling strong about my JavaScript testing game 💪, I think this covers the features well.

Also, modified the format of the resultsPkg sent back from operations:

Old:

{
    add: [{
        name: "along_line.geojson",
        geometry: {"type":"Feature","geometry":{"type":"Point","coordinates":[-10.839132601858164,38.352329563649434]},"properties":{}}
    }]
}

New:

{
    add: [{
        name: "along_line.geojson",
        geojson: {"type":"Feature","geometry":{"type":"Point","coordinates":[-10.839132601858164,38.352329563649434]},"properties":{}}
    }]
}

It felt a bit confusing to use geometry as a key when the data has a geometry key within it.

[alukach]

This was the only part of the tests that I couldn't get to operate properly. Still not sure what's up with it.

[alukach]

This one seems non-contentious, merging in.

[mapsam]

👍