Postgres: Operations, Hooks, OAuth login, Files support (#2528)

* Adds files related tests through fs-adapter with PG

* Schema deletions implementations

* Adds Hooks spec

* Fix test

* Adds support for containsAll (numbers and strings)

* Better support for deleteFields and deleteClass

* Recursive JSON update for authData

* Adds node_modules to travis cache

* Disable temporarily to make tests pass

* Adds _perishable_token support for _User class

* ignore when a table creation fails at init (table exists)

* Adds support for AddUnique and Remove

* PG 9.4 compatible functions

* Re-enable tests

* nit

* Better handling of schema creation race

package.json

@@ -32,7 +32,7 @@
     "mongodb": "2.2.5",
     "multer": "1.2.0",
     "parse": "1.9.1",
-    "parse-server-fs-adapter": "1.0.0",
+    "parse-server-fs-adapter": "1.0.1",
     "parse-server-push-adapter": "1.0.4",
     "parse-server-s3-adapter": "1.0.4",
     "parse-server-simple-mailgun-adapter": "1.0.0",