Fix child array building when attributes are available

Fixes bug in logic for building the array of child objects. Previously, <Child attr="value" /><Child attr="value" /> was returning "Child": {"attr": "value", 0: {"attr": "value"}} - should now return "Child": [{"attr": "value"}, {"attr": "value"}]

Update to array syntax for PHP 5.3 compliance

Merge pull request #1 from jameshalsall/hotfix/empty-text-nodes

Fixing logic where empty text nodes would be created as empty JSON #text...

Initial release of basic XML to JSON logic

0.1.1

Fix composer.json license definition