add clearCache function #111
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sometimes the Mapnik XML changed or the data changed, but rendering result of the tilelive does not changed, because tilelive style uses the cache if the Mapnik XML filename does not changed. this function helps to clear the cache dynamically, if the style has been changed, run it, tilelive will generate the newest rendering result .
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I find that when the Mapnik XML content changed or the data of the Mapnik XML changed, the rendering result of the tilelive-mapnik does not changed, because tilelive-mapnik still uses the cache if the Mapnik XML filename does not changed( I notice that tilelive mapnik store the cache throw uri). this function helps to clear the cache dynamically, if the style has been changed, run it, tilelive-mapnik will generate the newest rendering result .