Use @options (not @data) per Grunt guidelines

To get target > task > default option merging out of the box, you have
to use `options` when configuring; as opposed to putting the settings directly on
the target. Then, within the task, use `this.options([defaults])`.
de-dupe the specs array

No longer be at the mercy of how minijasminenode handles duplicate files
in `specs` option.
Update documentation and example with proper usage
Support the deprecated config format as well. (And log a message)
Merge pull request #2 from jasonkarns/options

Use @options (not @data) per Grunt guidelines