Fixed watchIgnorePatterns assignment

Default value for watchIgnorePatterns should be [], right now it's [ [] ] which breaks further code in forever-monitor watch.js file :

```
function watchFilter(fileName) {
  ...
  for (i = 0; i < length; i++) {
    testName = (this.watchIgnorePatterns[i].charAt(0) !== '/') ? relFileName : fileName;
    // this.watchIgnorePatterns[i] should be an String instance. Empty array breaks this code !
```