Delete node doesn't delete all predicates.

[pawanrawal]

User Steven mentioned on slack that delete node doesn't work for him.

mutation {
  schema{
    nodeType: string @index(term) .
    name: string .
    date: dateTime .
    weight: float .
    weightUnit: string .
    lifeLoad: int .
    stressLevel: int .
    plan: string .
    journalEntrhy: string .
  }
  set {
    _:day1 <nodeType> "TRACKED_DAY" .
    _:day1 <name> "July 3 2017" .
    _:day1 <date> "2017-07-03T03:49:03+00:00" .
    _:day1 <weight> "262.3" .
    _:day1 <weightUnit> "pound" .
    _:day1 <lifeLoad> "5" .
    _:day1 <stressLevel> "3" .
    _:day1 <plan> "modest day" .
    _:day1 <postMortem> "win!" .
    _:day2 <nodeType> "TRACKED_DAY" .
    _:day2 <name> "July 4 2017" .
    _:day2 <date> "2017-07-04T03:49:03+00:00" .
    _:day2 <weight> "260.1" .
    _:day2 <weightUnit> "pound" .
    _:day2 <lifeLoad> "3" .
    _:day2 <stressLevel> "4" .
    _:day2 <plan> "focus day" .
    _:day2 <postMortem> "double win!" .
    _:day3 <nodeType> "TRACKED_DAY" .
    _:day3 <name> "July 5 2017" .
    _:day3 <date> "2017-07-05T03:49:03+00:00" .
    _:day3 <weight> "259" .
    _:day3 <weightUnit> "pound" .
    _:day3 <lifeLoad> "8" .
    _:day3 <stressLevel> "9" .
    _:day3 <plan> "go with the flow" .
    _:day3 <postMortem> "I survived" .
  }
}
#### Query "tracked days already added"
{
  all_tracked_days(func: eq(nodeType, "TRACKED_DAY")) {
    name
    date
    weight
    lifeLoad
    stressLevel
    _uid_
  }
}
#### Results
{
  "data": {
    "all_tracked_days": [
      {
        "name": "July 5 2017",
        "date": "2017-07-05T03:49:03Z",
        "weight": 259,
        "lifeLoad": 8,
        "stressLevel": 9,
        "_uid_": "0x2"
      },
      {
        "name": "July 3 2017",
        "date": "2017-07-03T03:49:03Z",
        "weight": 262.3,
        "lifeLoad": 5,
        "stressLevel": 3,
        "_uid_": "0x3"
      },
      {
        "name": "July 4 2017",
        "date": "2017-07-04T03:49:03Z",
        "weight": 260.1,
        "lifeLoad": 3,
        "stressLevel": 4,
        "_uid_": "0x4"
      }
    ]
  }
}
#### Try to delete July 3
mutation {
  delete {
     <0x3> * * .
  }
}

[pawanrawal]

A fix has been merged to master and release/v0.8.2. The release binaries for v0.8.2 should be updated in a bit.