[Suggestion] More verbose failures

When specs fail, `grunt jasmine` just outputs something like this:

```
$ grunt jasmine
Running "jasmine:all" (jasmine) task
Running specs for index.html
F
<WARN> 1/1 assertions failed in 1 specs (21ms) Use --force to continue. </WARN>

Aborted due to warnings.
```

Maybe it should output which tests fails, and perhaps a tracelog to find out why.

What do you think?
