[openstreetmap/openstreetmap-website] Integrate the high-performance GPX importer (#1852)

[mmd]

https://github.com/zdennis/activerecord-import/wiki/Examples seems to suggest a different way of selectively turning off validations for the bulk insert:

```
# without validations
Book.import books, :validate => false

```

 This may be a more idiomatic approach as it avoids adding some artifical attributes via attr_accessor

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