Fixed parsers to use the correct type name in close_directive

Added directive support to pie
(Refactored pie parsing to be a bit more clear)
Added more unit tests to pie

src/diagrams/pie/pieDb.js

@@ -2,10 +2,16 @@
  *
  */
 import { logger } from '../../logger';
+import mermaidAPI from '../../mermaidAPI';
+import configApi from '../../config';
 
 let sections = {};
 let title = '';
 
+export const parseDirective = function(statement, context, type) {
+  mermaidAPI.parseDirective(this, statement, context, type);
+};
+
 const addSection = function(id, value) {
   if (typeof sections[id] === 'undefined') {
     sections[id] = value;
@@ -39,6 +45,8 @@ const clear = function() {
 // }
 
 export default {
+  parseDirective,
+  getConfig: () => configApi.getConfig().pie,
   addSection,
   getSections,
   cleanupValue,