At work we use a different syntax checker than I do when working on open source. Is there a way to have [`Syntastic`](https://github.com/scrooloose/syntastic) specify a default checker, and change checkers if an `rc` file is found at the project root? 

Example: if `.eslintrc` is found use [`eslint`](https://github.com/eslint/eslint). If no `.eslintrc` is found, use [`standard`](https://github.com/feross/standard). 

Thanks!

edit: also opened an issue on [scrooloose/syntastic](https://github.com/scrooloose/syntastic/issues/1327).