Allows usage of command-line options to a grunt goal target

You can not currently pass useful options to grunt, such as `--no-color`.  But with this change, you can!
```
...
<execution>
    <id>javascript tests</id>
    <phase>test</phase>
    <goals>
        <goal>grunt</goal>
    </goals>
    <configuration>
        <target>jasmine --no-color</target>
    </configuration>
</execution>
...
```