Usage:
simpleserver path/to/configuration
Configuration file is a JSON file. The JSON object's key is the request parameter to match, while the value are the pointer to the file to return.
The request matcher accepts a Regex as described by Express js. The file names can access the
matching params using $. So $param matches a parameter named param. The param names must be
one of: [a-zA-Z0-9_-]
Note that all paths are relative to the configuration.