Rails core - Mar 2014 - update_attribute violates POLA

POLA http://en.wikipedia.org/wiki/Principle_of_least_astonishment

Examples

```
# user.rb
class User < ActiveRecord::Base
  attr_accessible :name, :username
  validates :username, uniqueness: true
end

user1 = User.create(name: 'Name 1', username: 'username1')
user2 = User.create(name: 'Name 2', username: 'username2')

user1.username = 'username2'
user1.save # => false
user1.update_attribute(name: 'New Name')
user1.reload

user1.username # => 'username2'
# update_attribute is expected to update the specified attribute, not other 
ones. Thus it is violating POLA
```

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