Updated Rails 4.1.2 -> 4.1.4. This fixes vulnerability CVE-2014-3483

For more detail about the vuln:

http://seclists.org/oss-sec/2014/q3/5
Updated aws-sdk gem 1.45.0 -> 1.46.0
Updated rubyzip gem 1.1.4 -> 1.1.6
Updated brakeman 2.6.0 -> 2.6.1
Updated capybara-webkit gem 1.1.0 -> 1.2.0
Updated various gems to latest version.
Revert "Updated various gems to latest version."

This reverts commit 75adb4c0df3cf22d22dc60b2ffe60debb951a855.

ActiveAdmin stopped working with the gem updates in this commit, because of some missing jquery-ui component. Rolling back.
Fix acceptance test.