memcached service is required to run few specs

Found that was not running here

https://travis-ci.org/rails/rails/jobs/24216624#L110
Merge pull request #14944 from arunagw/aa-added-memcached-to-travis

memcached service is required to run few specs
Only accept actions without File::SEPARATOR in the name.

This will avoid directory traversal in implicit render.

Fixes: CVE-2014-0130
Preparing for 4.0.5 release
Fix tests with bundler 1.6
Merge branch '4-0-sec' into 4-0-stable

Conflicts:
	actionpack/CHANGELOG.md
	activerecord/CHANGELOG.md
	activesupport/CHANGELOG.md
	railties/CHANGELOG.md