Add nohidden option to check_box helpers to suppress hidden field when necessary
Fix Memoizable#prime_cache for private and protected methods

Matches change made in commit cc3183d4bec6855b9b5931759a22dd228dfe7687 for flushing cache.
Return a 405 response for unknown HTTP methods

Conflicts:
	actionpack/CHANGELOG.md
	actionpack/test/dispatch/debug_exceptions_test.rb