The RepChange attributes are out of date

[thomasoa]

Was using the user.reputation_detail, I tried to use members that apparently no longer exist.

Printing the change.json, I see examples like:

`{
       u'user_id': 11111, 
       u'on_date': 1444497094, 
       u'vote_type': u'up_votes', 
       u'post_id': 2222222, 
       u'post_type': u'answer',
       '_params_': {... stuff ...}, 
      u'reputation_change': 30
 }

`

All the code in the library seems to reference an older schema:

`
    user_id
    post_id
    post_type
    title
    positive_rep
    negative_rep

    on_date: datetime