Added exception message for spy_timeline:deploy

Added exception message for ```spy_timeline:deploy``` when verbosity level is at least 2 (command executed with ```-v``` option) and errors occurred.

```$ app/console spy_timeline:deploy -v```

**Before:**
```[TIMELINE] Error during deploy action 123```

**After:**
```[TIMELINE] Error during deploy action 123: The exception message```

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| License       | MIT