Support version for /nodes, /ways, /relations API calls

[simon04]

When reverting a changeset (e.g., using the JOSM plugin reverter), one needs to obtain a large number of objects in a specific version. At the moment, those are obtained sequentially one by one:

GET https://api.openstreetmap.org/api/0.6/node/618158454/6
GET https://api.openstreetmap.org/api/0.6/node/223240985/18
GET https://api.openstreetmap.org/api/0.6/node/1341712258/2
GET https://api.openstreetmap.org/api/0.6/node/674055923/7
GET https://api.openstreetmap.org/api/0.6/node/31446843/26

To improve performance, it would be great to obtain them in a single call:

GET https://api.openstreetmap.org/api/0.6/nodes?nodes=618158454/6,223240985/18,1341712258/2,674055923/7,31446843/26

Would it be acceptable to enhance node_controller#nodes with this feature? Depending on whether the version is present or not, either a Node or an OldNode would be fetched.

[bhousel]

Following.. Would really be useful for iD too.
Though we'd really want this implemented in cgimap.

[iandees]

I might suggest using dots rather than slashes to save in URL length? Slashes would have to be urlencoded to %2F.

[bhousel]

I might suggest using dots rather than slashes to save in URL length? Slashes would have to be urlencoded to %2F.

or the letter 'v' would be cool too