[FEATURES REQUEST]: take into account of wildignore option and filter FuzzyFiles results with readable.

[ubaldot]

I was thinking to a couple of improvements for this tool:

1. Take into account of the value of wildignore in the search patterns. Many user may have defined some patterns in their wildignore, that can include common patterns like for example .git, etc.
   option and finding results including what they want to exclude could be a bit annoying.
2. :FuzzyFiles may show non-readable files. If that is the case, would that be possible to exclude them from the list?