fix: Standardize the interface of the "jsonlint/lib/formatter" module

BREAKING CHANGE: The formatting method is exposed not as exports.formatter.formatJson, but as exports.format.
This module is not documented and it is unlikely, that it broke other project.

lib/formatter.js

@@ -1,19 +1,16 @@
-#!/usr/bin/env node
-
 /**
  * Manual formatter taken straight from https://github.com/umbrae/jsonlintdotcom
-**/
-
-/**
- * jsl.format - Provide json reformatting in a character-by-character approach, so that even invalid JSON may be reformatted (to the best of its ability).
  *
-**/
+ * jsl.format - Provide json reformatting in a character-by-character approach,
+ *   so that even invalid JSON may be reformatted (to the best of its ability).
+ *
+ */
 var formatter = (function () {
   function repeat (s, count) {
     return new Array(count + 1).join(s)
   }
 
-  function formatJson (json, indentChars) {
+  function format (json, indentChars) {
     var i = 0
     var il = 0
     var tab = (typeof indentChars !== 'undefined') ? indentChars : '    '
@@ -79,9 +76,9 @@ var formatter = (function () {
     return newJson
   }
 
-  return { 'formatJson': formatJson }
+  return { format: format }
 }())
 
 if (typeof require !== 'undefined' && typeof exports !== 'undefined') {
-  exports.formatter = formatter
+  exports.format = formatter.format
 }