Fixes #19873 - Fix Style/MultilineIfModifier cop (#5705)

• Refs #20891 - fix for new rubocop rules

• Fixes #19873 - Fix Style/MultilineIfModifier cop

Fixes #21611 - Improve *_name lookup speed

Fixes #16813 - improve error messages for associations

Fixes #13704 - Defensive association name setter
When setting an association by name
(e.g., hostgroup_name, organization_name)
and the name does not exist, we raise a not found error

fixes #13440 - rename Host#model_name to #hardware_model_name

Rails 4.2 defines a model_name instance method which is used in routing
and called from link_to. Rename our model_name methods to
hardware_model_name to prevent this overlapping and causing link_to...

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...

Refs #3809 - Remove cops for empty lines

fixes #9025 - reflect on association for _name(s) methods

Refs #3809 - Fix a few rubocop TODOs

fixes #4393 - rename ancestry label to title

fixes #2945 correction - has_and_belongs_to_many defined twice

fixes #2945 - extend AR to add getter/setters *_name(s) for has_many/belongs_to associations