Log Message:
Update ruby-json and ruby-json-pure to 1.7.7.

2013-02-04 (1.7.7)
  * Security fix for JSON create_additions default value and
    JSON::GenericObject. It should not be possible to create additions unless
    explicitely requested by setting the create_additions argument to true or
    using the JSON.load/dump interface. If JSON::GenericObject is supposed to
    be automatically deserialised, this has to be explicitely enabled by
    setting
      JSON::GenericObject.json_createble = true
    as well.
  * Remove useless assert in fbuffer implementation.
  * Apply patch attached to https://github.com/flori/json/issues#issue/155
    provided by John Shahid <jvshahid@gmail.com>, Thx!
  * Add license information to rubygems spec data, reported by Jordi Massaguer
    Pla <jmassaguerpla@suse.de>.
  * Improve documentation, thx to Zachary Scott <zachary@zacharyscott.net>.