Allow export multiple geojsons

[nileplumb]

Whilst the nest import is very helpful it is not 100% inclusive and in some areas too many areas are imported, manual adjustment and mini nest removal is required.

Once adjustments are made it would be handy to export all the areas at once for future import and spawn reporting

[abakedapplepie]

One issue i can see with this is losing nest meta data (name), I'm considering adding SQL storage to this script - caching nests and other data for later reuse without constant requerying.