chef-resource-lookup fixes:

- Fixed the URL to match new wiki.
- Added default keyboard shortcut to map.
Updated the readme.

It now displays the proper repository link and also documents the new
key binding (C-c C-d).
Small fixes for warnings in 24.3
Merge pull request #3 from webframp/fix-warnings

Small fixes for warnings in 24.3
Merge pull request #2 from babysnakes/new-docs-url

Update resource paths to new documentation site.