Adding back in support for browserify.

Commit 29fcfcb reverted the changes
from pull request #95 (unintentionally?). This adds the browserify
support back in.

toastr.js

@@ -299,7 +299,7 @@
 	});
 }(typeof define === 'function' && define.amd ? define : function (deps, factory) {
 	if (typeof module !== 'undefined' && module.exports) { //Node
-		module.exports = factory(require(deps[0]));
+		module.exports = factory(require('jquery'));
 	} else {
 		window['toastr'] = factory(window['jQuery']);
 	}