Added logger for dealing with issue #179

Added markdown files for the documentation.
parseError exposed from the mermaidAPI

src/diagrams/example/example.spec.js

@@ -7,7 +7,7 @@ describe('when parsing an info graph it',function() {
         ex = require('./parser/example').parser;
         ex.yy = require('./exampleDb');
         parseError = function(err, hash) {
-            console.log('Syntax error:' + err);
+            log.debug('Syntax error:' + err);
         };
         //ex.yy.parseError = parseError;
     });

src/diagrams/example/exampleDb.js

@@ -1,7 +1,7 @@
 /**
  * Created by knut on 15-01-14.
  */
-
+var log = require('../../logger').create();
 var message = '';
 var info = false;
 
@@ -22,5 +22,5 @@ exports.getInfo = function(){
 };
 
 exports.parseError = function(err,hash){
-    mermaid.parseError(err,hash);
+    mermaidAPI.parseError(err,hash);
 };

src/diagrams/example/exampleRenderer.js

@@ -4,7 +4,7 @@
 var db = require('./exampleDb');
 var exampleParser = require('./parser/example.js');
 var d3 = require('../../d3');
-
+var log = require('../../logger').create();
 /**
  * Draws a an info picture in the tag with id: id based on the graph definition in text.
  * @param text