refactor data parsing

parser classes for different formats are instantiated in parse.js and returns arrays of words, links, and clusters

Author: hmsklee

index.html

@@ -76,8 +76,9 @@
 
 <script src="js/xhr.js"></script>
 <script src="js/ymljson.js"></script>
-<script src="js/ann-parser.js"></script>
-<script src="js/parser.js"></script>
+<script src="js/parse/parse.js"></script>
+<script src="js/parse/ann.js"></script>
+<script src="js/parse/reach.js"></script>
 <script src="js/treelayout.js"></script>
 <script src="js/main.js"></script>
 <script src="js/managers/tooltip.js"></script>