Improve compatibility with JS modules

If a module ended with a single line comment `\\` then the appended
`;})();` was being ignored and eaten up as part of the comment.

boot/boot.js

@@ -413,7 +413,7 @@ $tw.utils.evalGlobal = function(code,context,filename) {
 		contextValues.push(value);
 	});
 	// Add the code prologue and epilogue
-	code = "(function(" + contextNames.join(",") + ") {(function(){\n" + code + ";})();\nreturn exports;\n})\n";
+	code = "(function(" + contextNames.join(",") + ") {(function(){\n" + code + "\n;})();\nreturn exports;\n})\n";
 	// Compile the code into a function
 	var fn;
 	if($tw.browser) {