array_key_exist in _arrayToXml error [0.2.6] (issue #44)

This version introduces multiple enhancements:

fixed conversion array to xml with attributes
changed version in composer

Details of additions/deletions below:
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Modified:   Base/BlueObject.php
            -- Updated --
                _arrayToXml check that $value is array before array_key_exists execution

Modified:   composer.json
            -- Modified --
                changed version from 0.2.5 to 0.2.6