Log Message:
Update ruby-json{,_pure} to 1.4.6.

2010-08-09 (1.4.6)
  * Fixed oversight reported in http://github.com/flori/json/issues/closed#issue/23,
    always create a new object from the state prototype.
  * Made pure and ext api more similar again.
2010-08-07 (1.4.5)
  * Manage data structure nesting depth in state object during generation. This
    should reduce problems with to_json method definіtions that only have one
    argument.
  * Some fixes in the state objects and additional tests.
2010-08-06 (1.4.4)
  * Fixes build problem for rubinius under OS X, \ 
http://github.com/flori/json/issues/closed#issue/25
  * Fixes crashes described in \ 
http://github.com/flori/json/issues/closed#issue/21 and
    http://github.com/flori/json/issues/closed#issue/23