* Remove collection prefix from DB Controller
* Remove collection prefix from cache
* Revert "Remove collection prefix from cache"
This reverts commit 529d67dd617b64c69c36a8a63382456e95edcab8.
* Remove knowledge of default mongo URI from Parse Server
* Remove adaptive collection paramater from deleteFields
* Tidy up DBAdapter.js
Move object ID, token, and random string generation into their own
module, cryptoUtils.
Remove hat dependency, which was used to generate session and some other
tokens, because it used non-cryptographic random number generator.
Replace it with the cryptographically secure one. The result has the
same format (32-character hex string, 128 bits of entropy).
Remove randomstring dependency, as we already have this functionality.
Add tests.
