Fixed parsing of json maps

[robfelty]

Valid YAML such as the following is not correctly parsed by the Spyc fork used in wp-cli. If you validate the following with other YAML validators such as yamllint.com, it is returned as valid Yaml.

key: {"json_key":"json_value", "json_key2": "json_value2"}

This should be represented in PHP as:

  'key' =>
  array (
    'json_key' => 'json_value',
    'json_key2' => 'json_value2',
  ),
)

However, when running through the Spyc.php implementation, the following is returned:

array (
  'key' =>
  array (
    0 => 'json_key":"json_value',
    1 => 'json_key2": "json_value2',
  ),
)

This can be tested by running one of the example scripts

cd examples
php yaml-load.php

I have added two additional tests in the spyc.yaml file to test this issue. If you run the example yaml-load.php script you will see that they are handled correctly and all of the existing examples are unchanged.