[openstreetmap/openstreetmap-website] add bulk_upload (#1995)

[mmd]

It's pretty much the same performance optimization I described in https://github.com/openstreetmap/openstreetmap-website/issues/1710 and also implemented in cgimap. I tested a few easy cases via url rewriting (upload --> bulk_upload), and they seemed ok. The current code seems to be duplicating quite a lot of stuff, i.e. @gravitystorm probably wants to to through the code.

The general concept of bundling many small sql statments into larger ones works, regardless of which language issues the requests. Still there's some more overhead in Rails processing (about factor 5 in one test case).

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