code: public static Chainr fromFileSystem( String chainrSpecFilePath, ChainrInstantiator chainrInstantiator ) {
          Object chainrSpec = JsonUtils.filepathToObject( chainrSpecFilePath );
          return getChainr( chainrInstantiator, chainrSpec );
      }
docs: Builds a Chainr instance using the spec described in the data via the file path that is passed in.
  
  @param chainrSpecFilePath The file path that points to the chainr spec.
  @param chainrInstantiator the ChainrInstantiator to use to initialze the Chainr instance
  @return a Chainr instance