Fixes #7230, #12021 - Upgrade to Rails 4.1.5

This commits upgrades Rails to Rails 4.1.5. See a description of the
changes included here, and go to the pull request in GitHub to see more
detailed explanations:

• Update gems to a Rails 4 compatible version, including dependencies...

Fixes #12842 - Adding padding below use puppet default checkbox in puppetclass edit form

fixes #11862 - validating that casted hash is valid

Catch parse errors correctly under Ruby 1.9.3, and ensure the uncasted
value is displayed back in the UI if it fails to parse.

Fixes #12752 - Host and hostgroup clone should copy smart class parameters overrides

Fixes #6007 - Allowing to hide smart class parameters

fixes #1584 - bulk owner change

fixes #12624 - add plugin interface to add provision methods

Fixes #12554 - Change OS name column heading to match contents

It is necessary to change name for 'Name' column to 'Title' as
otherwise application flow can confuse user (especially when he or she
perform search procedure). Also, add more context to description field...

Fixes #12506 - Show smart proxies version in about page

Fixes #8799 - Show override button when removing overriden global param

Previously, when removing an override for an existing parameter the
override button was not displayed again until the page was reloaded.
Also saved call to `mark_params_override()` when overriding a single...