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/er/erDb.js

@@ -3,6 +3,7 @@
  */
 import { logger } from '../../logger';
 import mermaidAPI from '../../mermaidAPI';
+import configApi from '../../config';
 
 let entities = {};
 let relationships = [];
@@ -73,6 +74,7 @@ export default {
   Cardinality,
   Identification,
   parseDirective,
+  getConfig: () => configApi.getConfig().er,
   addEntity,
   getEntities,
   addRelationship,

src/diagrams/er/parser/erDiagram.jison

@@ -111,7 +111,7 @@ argDirective
   ;
 
 closeDirective
-  : close_directive { yy.parseDirective('}%%', 'close_directive', 'sequence'); }
+  : close_directive { yy.parseDirective('}%%', 'close_directive', 'er'); }
   ;
 
 %%