Fix Dependencies -> Array conversion

Library/Homebrew/dependencies.rb

@@ -119,9 +119,10 @@ class Dependencies
     @deps * arg
   end
 
-  def to_ary
+  def to_a
     @deps
   end
+  alias_method :to_ary, :to_a
 end
 
 module Dependable

Library/Homebrew/test/test_dependencies.rb

@@ -33,7 +33,15 @@ class DependenciesTests < Test::Unit::TestCase
     assert_equal %q{foo, bar}, @deps*', '
   end
 
+  def test_to_a
+    dep = Dependency.new("foo")
+    @deps << dep
+    assert_equal [dep], @deps.to_a
+  end
+
   def test_to_ary
-    assert_instance_of Array, @deps.to_ary
+    dep = Dependency.new("foo")
+    @deps << dep
+    assert_equal [dep], @deps.to_ary
   end
 end