Use \ to concatenate multi-line strings

Change-Id: Ife60650370faa18249edb730d7d047475fc08d70
Reviewed-on: http://gerrit.causes.com/37014
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>
Enable CollectionMethods cop in Rubocop

Could be helpful to unify the used collection methods.

Change-Id: Icbe5e367c2a05924ad45393d3559c8c8481b458e
Reviewed-on: http://gerrit.causes.com/37015
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>