pouchdb 3.0.0 on Node.js NPM

The browser build pouchdb-nightly.js has been renamed to pouchdb.js. It was never really a nightly anyway. (#2146)
opts.server has been deprecated from the replicate() and sync() APIs. You can still replicate from one HTTP server to another, but the data will flow through PouchDB rather than being server-initiated. (#2313)
You can no longer rely on errors to have an identifying name. Instead, rely on CouchDB-centric errors to have a status (i.e. err.status instead of err.name). There are some that still have an identifying name, but these could be removed at any time. The upside of this is that stack traces should be more consistently helpful. (#2545)

Local documents are now unversioned for better map/reduce performance and to better align the update_seq with CouchDB (#2023). Also fixes an issue with replication and changes(). (#2342)
Constructor option opts.size to work around Safari/iOS storage quotas (#2347)
PouchDB.defaults() for default constructor options, which permits many new features in pouchdb-server. (#2054)
Performance improvements. (#2391, #2392, #2393)
MD5 hashes are now calculated incrementally in a way that won't freeze the DOM. (#445, #2497)
More efficient replication. (#2466, #2475)

Fix for replication of multiple attachments. (#2358)
Fix for bulkDocs() in Cloudant. (#2365)
Fix read-only replication for CORS/40*. (#2484)
Fix for reserved words in docs. (#2477)
Fixes for change events in .sync(). (#2555)
Fixes for race condition in bulk docs with new_edits=false in LevelDB. (#2574)
Fixes for opts.stale in query(). (pouchdb/mapreduce#196, pouchdb/mapreduce#198)