Postgres adapter (#2012)

* Remove adaptiveCollection

* Remove an adaptiveCollection use

* Remove an adaptiveCollection

* make adaptiveCollection private

* Remove collection from mongoadapter

* Move schema collection usage into mongo adapter

* stop relying on mongo format for removing join tables

* reduce usage of schemaCollection

* remove uses of _collection

* Move CLP setting into mongo adapter

* remove all uses of schemaCollection

* make schemaCollection private

* remove transform from schemaCollection

* rename some stuff

* Tweak paramaters and stuff

* reorder some params

* reorder find() arguments

* finishsh touching up argument order

* Accept a database adapter as a parameter

* First passing test with postgres!

* Actually use the provided className

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

* Start dealing with test shittyness

* Make specific server config for tests async

* Fix email validation

* Fix broken cloud code

* Save callback to variable

* undo

* Fix tests

* Setup travis

* fix travis maybe

* try removing db user

* indentation?

* remove postgres version setting

* sudo maybe?

* use postgres username

* fix check for _PushStatus

* excludes

* remove db=mongo

* allow postgres to fail

* Fix allow failure

* postgres 9.4

* Remove mongo implementations and fix test

* Fix test leaving behind connections

spec/schemas.spec.js

@@ -327,9 +327,9 @@ describe('schemas', () => {
   });
 
   it('responds with all fields when getting incomplete schema', done => {
-    config.database.schemaCollection().then((schema) => {
-      return schema.addSchema('_User');
-    }).then(() => {
+    config.database.loadSchema()
+    .then(schemaController => schemaController.addClassIfNotExists('_User', {}, defaultClassLevelPermissions))
+    .then(() => {
       request.get({
         url: 'http://localhost:8378/1/schemas/_User',
         headers: masterKeyHeaders,