Add code to distinguish cmd and electron envirmonment

The way to judge whether in CommonJs style can not distinguish real
CommonJs from electron, will case BootstrapDialog object set to
window.module.exports.
Same problem may occur in node webkit,but I do not test this situation.

dist/js/bootstrap-dialog.js

@@ -17,7 +17,13 @@
 
     // CommonJS module is defined
     if (typeof module !== 'undefined' && module.exports) {
-        module.exports = factory(require('jquery'), require('bootstrap'));
+        var isNode = (typeof process !== "undefined" && typeof require !== "undefined");
+        var isElectron = isNode && (typeof require('ipc') !== "undefined");
+        if(isElectron) {
+            root.BootstrapDialog = factory(root.jQuery);
+        } else {
+            module.exports = factory(require('jquery'), require('bootstrap'));
+        }
     }
     // AMD module is defined
     else if (typeof define === "function" && define.amd) {

src/js/bootstrap-dialog.js

@@ -17,7 +17,13 @@
 
     // CommonJS module is defined
     if (typeof module !== 'undefined' && module.exports) {
-        module.exports = factory(require('jquery'), require('bootstrap'));
+        var isNode = (typeof process !== "undefined" && typeof require !== "undefined");
+        var isElectron = isNode && (typeof require('ipc') !== "undefined");
+        if(isElectron) {
+            root.BootstrapDialog = factory(root.jQuery);
+        } else {
+            module.exports = factory(require('jquery'), require('bootstrap'));
+        }
     }
     // AMD module is defined
     else if (typeof define === "function" && define.amd) {