making the spinner stop after 10sec if the data is not loaded.

[neelesh17]

Fixes #290 (<=== Add issue number here)

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[neelesh17]

@crisner I made the changes you asked me for. But the build keeps failing.

[crisner]

No worries @neelesh17. I'll take a look at it by the end of the day.

[neelesh17]

Hey @crisner, the cypress checks for layerFilter is failing and i am not sure why it is happening. And all the functionality for spinner is done.

[crisner]

@neelesh17, let us put this on hold while we wait for a reply to https://github.com/publiclab/leaflet-environmental-layers/issues/290#issuecomment-593244921. As for the tests failing, it is because of the changes in a recent PR. There is an open PR with the fix. The tests will pass once the PR is reviewed and merged. Thanks!