* Changed the license in package json to the correct license (MIT).

* Changed the link style from the pointed one to a more triangle formed style as default style for links
* Updated the readme file regarding linkStyles to explain the magic number 3a s described in issue #41

src/main.js

@@ -103,7 +103,7 @@ exports.addEdges = function (edges, g) {
             aHead = 'none';
         }
         else{
-            aHead = 'vee';
+            aHead = 'normal';
         }
 
         var style = '';