Attach stats to data object

[mattidupre]

First brought up in #279, it would be useful having access to the stats object from node-sass.

My use case: I frequently include scss files from node_modules via npm link. If I'm working on those particular modules I have to either manually declare their respective paths to gulp.watch, watch the entire node_modules directory, or trigger my builds manually. I would like to be able to just pull those files from the data object and add them to my watch list downstream.

Actually, as I'm writing this I realize I could limit my recursion in my watch task. I would still rather not worry about the performance hit. If I'm missing something else though I'm open to alternatives.

Edit: Sorry, just realizing that #279 became that very issue. Should have just commented there. Apologies.

[mattidupre]

Just bumped into this issue again and realized it has not been implemented.