Regenerate sid when sbdy tries to fixate the session

Fixed broken test.

Thanks Stephen Richards for reporting.
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
correctly escape backslashes in request path globs

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

make sure that unreadable files are also not leaked

CVE-2014-7829
bumping version for relesase
fix ruby 2.2 warning: circular argument reference
Check `respond_to` before delegation due to: https://github.com/ruby/ruby/commit/d781caaf313b8649948c107bba277e5ad7307314
Merge pull request #2 from tmm1/3-2-ruby-2-2

3 2 ruby 2 2