Functional DataTable with JsonRenderer output
Modified Date/DateTime/TimeValue data types so toString() returns output strings instead of JSON strings.  JsonRenderer now handles the JSON formatting of those.
Added tests for Servlet and ResponseWriter
Refactored DateValue, DateTimeValue, TimeOfDayValue to move duplicate code into the Date object
Now use PHP native method name __toString
Added more unit tests
Added simple example usage
Renamed repository to google-visualization-php
Fixed Servlet test
Change namespace to match new Repository name
Updated metadata