Added aspect ratio constraint

[ghost]

This should merge properly, I think. Sorry about my last pull request.

[jasekz]

Can you explain what issue you were having and are attempting to fix? Also, I can't merge changes where you're changing the repo name, i.e - "name": "jjfs85/laradrop". If you'd like to do that, you should fork it instead.

[ghost]

My intended feature addition is a config parameter called thumb_aspect that is a boolean and when it is set to true, the thumbnail generation will maintain the original image's aspect ratio. I admit the the above set of commits look messy, but look at the file comparison between your present dev branch and my pull request, you'll see only two files have changes: the laradropController and the config.php. I've reverted your repo name and namespace changes.

[jasekz]

Ok, thanks. Cool feature, but would you be able to also implement the option to maintain the height? Just in case someone wants to maintain the height instead of width.