Better support for SlimPHP

README.md

 - "cachePath": Path/address of the cache (defaults to system's temp directory)
 - "cacheTime": Number of seconds the cache is valid (`10`)
 - "debug": Show errors in the "X-Debug-Info" header (`false`)
+- "basePath": URI base path of the API (determined using PATH_INFO by default)
 
 ## Limitations