2.3.00 - Feb/24/2014
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    - Added 'get attribution' function to Leaflet canvas layer.
    - Added zIndex support to leaflet torque layer
    - Added CartoDB Maps API data provider (used by default)
    - Fixed rendering when CartoCSS had zoom conditions (#27)

2.2.00 - Nov/26/2013
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    - added torque cumulative support #21

2.1.00 - 11/11/2013
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    - added support to custom SQL query
    - removed is_time option, it's not fetch from SQL-API
    - steps is now the upper limit for steps
    - multiple fixes