FileHandler should not be called for files outside the root

FileHandler#matches? should return false for files that are outside the
"root" path.

Conflicts:
	actionpack/lib/action_dispatch/middleware/static.rb

Conflicts:
	actionpack/lib/action_dispatch/middleware/static.rb
	actionpack/test/dispatch/static_test.rb
bumping version to 3.2.20
Merge branch '3.2.20' into 3-2-stable

* 3.2.20:
  bumping version to 3.2.20
  FileHandler should not be called for files outside the root