karma-runner/karma — pull request #1084 by huangyingjie (2014-06-02 06:49:53+00:00)
Title: replace simple reassign with  _.merge

The following code will override some default option that is an Object, like config.client.
```js
this.set = function(newConfig) {
Object.keys(newConfig).forEach(function(key) {
config[key] = newConfig[key];
});
};
```
If someone want to pass an custom property to client, He has to pass all the properties:useIframe,args,and captureConsole, or they will be lost.
So I suggest replace this with following:
```js
this.set = function(newConfig) {
config = _.merge(config, newConfig);
};
```