Omnisearch design and behaviors
Wire a first attempt at omni-search up to the backend.

* Create a search functionality which looks for files on the filesystem
* Wire in new /app/:id/search/*query URL
* Connect with UI for omni-search.

Many many questions left here.
Further work on omnisearch functionality & design
Quick and dirty T binding
Prevented omnisearching multiple times for same string
Merge pull request #197 from typesafehub/wip/omnisearch

First implementation of omnisearch