Remove support for Zeus.

Has been replaces by Spring in all our Rails projects.
Revert "Add workaround for double escaped links in RSpec 2.14"

This reverts commit 645a709a28db2128d30866dc354569b0041ead3e.

Has been fixed in RSpec 2.14.8: https://github.com/rspec/rspec-core/blob/master/Changelog.md#2148--2014-02-27