Update Rubocop configuration

Add some overrides that are new as of Rubocop 0.19.1

Change-Id: I76b707f9160a593fe5c9a171687dc9e3cd068e0b
Reviewed-on: http://gerrit.causes.com/37012
Tested-by: jenkins <jenkins@causes.com>
Reviewed-by: Shane da Silva <shane@causes.com>