[openstreetmap/openstreetmap-website] Limits on number of tags and relation members (#1711)

[mmd]

I created the following patch https://github.com/mmd-osm/openstreetmap-website/commit/e6f8fcfbedde2dc9771c8eef1d6a54ff0109c085 which covers the following topics:

* Saving relations checks relation member limit
* settings.yml: new parameter `max_number_of_relation_members: 32000`
* `/api/0.6/capabilities` now includes a new element `relationmembers`
* New error message "You tried to add #{provided} members to relation #{id}, however only #{max} are allowed" is already being used by CGImap
* Unit test for all changes

```xml
<?xml version="1.0" encoding="UTF-8"?>
<osm version="0.6" generator="OpenStreetMap server" copyright="OpenStreetMap and contributors" attribution="http://www.openstreetmap.org/copyright" license="http://opendatacommons.org/licenses/odbl/1-0/">
  <api>
    <version minimum="0.6" maximum="0.6"/>
    <area maximum="0.25"/>
    <note_area maximum="25"/>
    <tracepoints per_page="5000"/>
    <waynodes maximum="2000"/>
    <relationmembers maximum="32000"/>
    <changesets maximum_elements="10000"/>
    <timeout seconds="300"/>
    <status database="online" api="online" gpx="online"/>
  </api>
  <policy>
    <imagery>
      <blacklist regex=".*\.google(apis)?\..*/(vt|kh)[\?/].*([xyz]=.*){3}.*"/>
      <blacklist regex="http://xdworld\.vworld\.kr:8080/.*"/>
      <blacklist regex=".*\.here\.com[/:].*"/>
    </imagery>
  </policy>
</osm>

```


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