Add support for bower.json files installed as hidden files by Bower

Some modules that I've installed using Bower include ".bower.json" files in their install bundle, rather than "bower.json". It looks like this breaks index.js on line 101, since "bower.json" is hard-coded as not hidden.

See for instance https://github.com/carhartl/jquery-cookie

Start by reading index.js around line 101 and reproduce the issue with the jquery-cookie module linked in the report. Trace how the resolver looks for bower.json files, then verify that modules containing only .bower.json resolve correctly.

Written by the indexing model from the issue text.