3.7

1. Support of X axis with custom labels like:
   http://web-docs.gsi.de/~linev/js/3.7/index.htm?nobrowser&json=../files/hist_xlabels.json

2. Extend functionality of JSROOT.addDrawFunc() function. One could register type-specific
   make_request and after_request functions; icon, prereq, script, monitor properties.
   This let add more custom elements to the generic gui, implemented with JSROOT.HierarchyPainter

3. Provide full support of require.js. One could load now JSRootCore.js script like:

   <script type="text/javascript" src="require.js" data-main="scripts/JSRootCore.js"></script>

   After this several modules are defined and can be used with syntax like:

   require(['JSRootPainter'], function(jsroot) { /*any user code*/});

   Also inside JSROOT require.js used to load all dependencies.