nuclide-file-tree: add "search in directory" about nuclide

[oclbdk]

We would love to add this to the Nuclide file tree, but it's not a high priority in our immediate plans.

The package that adds it to the Atom file tree (https://github.com/atom/find-and-replace) is hardcoded to the Atom file tree CSS selectors. Ideally, we would be able to add this through a service-based API.

[bolinfest]

We also need atom/atom#7022 to be accepted by GitHub so we can support this for remote directories, as well.

[tsunammis]

@oclbdk Thank you, I remain patient

[torifat]

Can you please list a few features which are not high priority according to you. So that, we can contribute those from community. There are things like, bring all the shortcuts in nuclide-file-tree.

[tsunammis]

@torifat Ensure compatibility with existing modules, for example, I get some troubles with Color Piker, and I think there are another issues with probably the other modules.

Then, a shortcut to search only on a specific directory (current directory selected) ?

[bolinfest]

This has been fixed!