Merge modules before minification

[gfwilliams]

Add a minification option that converts module code of the form:

// these lines currently get added by the ide
Modules.removeAllCached();
Modules.addModule("x","exports.foo = function() {console.log('Hello'); };exports.unused = 42;");
// actual code
var a = require("x");
a.foo();

to something like:

// these lines currently get added by the ide
var required_x = (function(){
  var exports = {}; 
  exports.foo = function() {console.log('Hello'); }; 
  exports.unused = 42;
  return exports; 
})();
// actual code
var a = required_x;
a.foo();

This might need some tweaking, but the idea is that when the minifier runs, it can:

• Inline small functions/variables in modules
• Make function names in modules a single name
• Detect unused functions and totally remove them

This would massively decrease the size of uploaded code.