Remove 2nd parameter from json_encode() function

The options parameter was not added to json_encode() until PHP 5.3, so this is causing warnings on systems < 5.3.  Additionally, the options parameter should be a bitmask using JSON constants instead of a boolean.  http://php.net/manual/en/function.json-encode.php
Merge pull request #39 from jrrdnx/master

Remove 2nd parameter from json_encode() function