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