fix(JSON): Fix nested json

[silbinarywolf]

Related Issue:
#28

This is currently broken on purpose. So far this just has the test case in.

Whats left to do:

• Update the $expectedHTML for testJSONDeeplyNested to be what the HTML output should be.
• We need to update the outputting of a SilverStripe template so that instead of using var_export($value, true) to get PHP code of an array with nested arrays, we simply walk the entire array structure and generate the needed PHP code.

How to recursively walk an array structure

<?php
// Iteration on leafs AND nodes
foreach (new RecursiveIteratorIterator(new RecursiveArrayIterator($candidate), RecursiveIteratorIterator::CATCH_GET_CHILD) as $key => $value) {
    echo 'My node ' . $key . ' with value ' . $value . PHP_EOL;
}

Source: http://php.net/manual/en/function.array-walk-recursive.php#116876

[JoshuaCarter]

Closing due to:
#30
#31