updated grunt logs to be less verbose

As discussed in pull/101, I'm resubmitting the change to decrease the verbosity when compile templates.
- Default mode:
```
Running "handlebars:compile" (handlebars) task
>> 122 files created.
```
- Verbose mode:
```
File template1.js created.
File template2.js created.
File template3.js created.
...
>> 122 files created.
```