Prevents _User lock out when setting ACL on signup or afterwards

[flovilmart]

When creating and updating a user, ever set R/W on the user.

Ran the test against parse.com to make sure we match behaviours.

fixes: #1390

[codecov-io]

Current coverage is 92.80%

Merging #1429 into master will not affect coverage as of 1a24b30

@@            master   #1429   diff @@
======================================
  Files           86      86       
  Stmts         5460    5464     +4
  Branches      1007    1009     +2
  Methods          0       0       
======================================
+ Hit           5067    5071     +4
  Partial         10      10       
  Missed         383     383       

Review entire Coverage Diff as of 1a24b30

Powered by Codecov. Updated on successful CI builds.