Add brew uses --recursive

Closes Homebrew/homebrew#8870.

Library/Homebrew/cmd/uses.rb

@@ -11,9 +11,11 @@ module Homebrew extend self
 
     uses = Formula.all.select do |f|
       ARGV.formulae.all? do |ff|
-        # For each formula given, show which other formulas depend on it.
+        if ARGV.flag? '--recursive'
-        # We only go one level up, ie. direct dependencies.
+          f.recursive_deps.include? ff
-        f.deps.include? ff.name
+        else
+          f.deps.include? ff.name
+        end
       end
     end