tree 0b506220f9b7acb3a03d1c42aee407cba8a4279c
parent bf9cd2b1c36909b41fc3db40f4a2c351e2e43182
author Nick Vatamaniuc <vatamane@gmail.com> 1460669340 -0400
committer Nick Vatamaniuc <vatamane@gmail.com> 1460734157 -0400

Implement Mango selectors for change feeds

API is modeled after _doc_ids filter for change feeds.

User POSTs to {db}/_changes with `filter=_selector`.
Document body should have a "selector" field, with
a Mango selector object as value.

For example:
```
http http://.../d1/_changes?filter=_selector
{
  "selector": {"z" : {"$gte" : 1} }
}
```

Jira: COUCHDB-2988