adds --bbox parameter to 'tilekiln-generate area' utility which allows restricting generated tiles to smaller area
bbox is provided as a string with coordinates separated by commas e.g.: -180,-90,180,90 for the entire world (which is the default if no value provided)
issue #8
adds --bbox parameter to 'tilekiln-generate area' utility which allows restricting generated tiles to smaller area bbox is provided as a string with coordinates separated by commas e.g.: -180,-90,180,90 for the entire world (which is the default if no value provided)