File Finder Feature

Created by: koreamic

I've been using Gitlab and I think it is awesome!!!.

As I know, Gitlab has no 'file finder' feature like Github (https://github.com/blog/793-introducing-the-file-finder)

I read the following old article in your feedback. (http://feedback.gitlab.com/forums/176466-general/suggestions/4987909-add-file-finder-fuzzy-input-in-files-tab-to-ju)

Using not the fuzzy logic but the regular expression, I developed the feature.

If I create a pull request, review my pull request?