Test bulk_docs with new_edits=false

When we add two documents with the same it's not always true
    that we generate conflicts.
(#535) - fix in indexeddb adapter
(#535) - can't return [] when bulkDocs with new_edits=false

It's due to the fact that put uses bulkDocs. Don't know how to
implement it properly right now
(#535) - modify test so we don't check for empty array
(#535) - fix websql adapter
(#535) - leveldb adapter fix
(#535) - new_edits default value moved to generic adapter
(#535) - add pouch.adapter.js

Forgotten that modified guy
Merge pull request #544 from neojski/535-bulk_docs-conflicts

(#535) - bulk docs conflicts