(#2577) - add some attachments tests
(#2525) - Replace browserstack icon

- Optimized icon.svg and logo.svg with SVGO
- Added target='_blank' to the external logos
- Replaced browserstack with leveldb
(#2631) - Start lock before reading current doc
Revert "(#2577) - add some attachments tests"

This reverts commit 9e5d826e65b361c907a6650e7eed9bc4dd6f049e.
Revert "Revert "(#2577) - add some attachments tests""

This reverts commit 458ccdcce3c1f2477815dbc73a1f56639133f485.
(#2644) - Make code indentation consistent across site
(#2639) - make sure we do no more writes after replication is over
(#2449) - expose HTTP headers for plug-in use
(#2640) - Remove assertion in changes order
(#2651) - allow % in doc IDs
(#2636) - fix replication of deleted docs
(#2656) - PouchDB 3.0.2 blog post
(#2656) - update configs for 3.0.3-prerelease