Add unique indexing for username/email

WIP

Notes on how to upgrade to 2.3.0 safely

index on unique-indexes: c454180 Revert "Log objects rather than JSON stringified objects (#1922)"

reconfigure username/email tests

Start dealing with test shittyness

most tests passing

Make specific server config for tests async

Fix more tests

Save callback to variable

undo

remove uses of _collection

reorder some params

reorder find() arguments

finishsh touching up argument order

Accept a database adapter as a parameter

First passing test with postgres!

Fix tests

Setup travis

sudo maybe?

use postgres username

reorder find() arguments

Build objects with default fields correctly

Don't tell adapter about ACL

WIP

Passing postgres test with user

Fix up createdAt, updatedAt, nad _hashed_password handling

2.3.0.md

@@ -77,6 +77,6 @@ coll.aggregate([
   {$match: {count: {"$gt": 1}}},
   {$project: {id: "$uniqueIds", username: "$_id", _id : 0} },
   {$unwind: "$id" },
-  {$out: '_duplicates'} // Save the list of duplicates to a new, "_duplicates collection. Remove this line to just output the list.
+  {$out: '_duplicates'} // Save the list of duplicates to a new, "_duplicates" collection. Remove this line to just output the list.
 ], {allowDiskUse:true})
 ```