(#2326) - ignore cordova/www in jshint

Otherwise the files in deps/ are throwing
errors and annoying me.
(#2331) - forgot to commit version-browser.js
(#2332) - fix dev server callback error
(#2283) - 'destroyed' event has correct db name
(#2054) - implement PouchDB.defaults

This also fixes a few bugs in how opts.db
is used in leveldb.js, namely:

1. the leveldown object was overriden globally in the browser
2. databases with the same names but different backends collided
(#2356) - fix syntax errors in put() docs
(#2347) - add opts.size to fix websql quota bug
(#2335) - add more plugins and better organize external.md
(pouchdb/pouchdb-server#45) - fix default opts on destroy
(#2339) - document localStorage warning in Chrome apps
(#2369) - Adds plugins to the external projects page

Also generalizes Python-PouchDB's description a bit.
(#2380) - test performance in node
(#2379) - Fixing a typo
Revert "(#2380) - test performance in node"

This reverts commit 8e9f4d7ed2c2f0f9b7f7bb01430d66f68b02c171.
(#2023) - don't save revisions of local docs
(#2023) - WIP - fix browser adapter plugins
(#2023) - WIP - implement for websql
(#2023) - WIP - websql still broken