Initial unit tests added

Added Mocha to the project along with initial set of unit tests for parsers (Twee and HTML) as well as for FileReader.

Noticed bugs in process and changed TweeParser and HTMLParser code.

.gitignore

@@ -1,5 +1,4 @@
 node_modules
-testing
 storyformats
 builds
 .DS_Store

HTMLParser.js

@@ -12,13 +12,11 @@ class HTMLParser {
      * @constructor
      */
     constructor (content) {
-        this.inputContents = content;
-        this.outputContents = "";
 
         this.dom = null;
         this.story = null;
 
-        this.parse(this.inputContents);
+        this.parse(content);
     }
 
     parse(content) {

TweeParser.js

@@ -25,7 +25,7 @@ class TweeParser {
      */
     parse(fileContents) {
 
-    	// Check if there are extra notes in the files
+    	// Check if there are extra content in the files
     	// If so, cut it all out for the parser
     	if(fileContents[0] != ':' && fileContents[1] != ':') {
 
@@ -215,24 +215,14 @@ class TweeParser {
 
         	} catch(event) {
 
-        		// Silently fail
-        		this.story.metadata = {};
+        		// Silently fail with default values
 
         	}
 
             // Remove the StoryMetadata passage
             this.passages = this.passages.filter(p => p.name !== "StoryMetadata");
 
-        } else {
-
-            if(!this.story.metadata.hasOwnProperty('ifid') ) {
-
-                throw new Error("This story does not have an IFID.");
-
-            }
-
-        }
-
+        }	
 
         // Set the passages to the internal story
         this.story.passages = this.passages;