Improve checking for Cloud Queue message IDs.

The previous regex failed if the queue name contained a "-".
Merge pull request #2820 from jcollie/cloud_queue_message_id

Improve checking for Cloud Queue message IDs.
Add Rubocop and Fuubar to development dependencies
Add Rubocop config files
Rubocop: allow Void enforcement
Fix some errors and dead code caught by void-context warnings
Rubocop: allow EndAlignment enforcement
Correct misaligned "ends" caught by Rubocop
Rubocop: allow AmbiguousOperator enforcement
Fix a couple of ambiguous uses of &block parameters
Rubocop: allow ConditionPosition enforcement
Fix "single line" conditionals that were broken into two lines
Rubocop: allow StringConversionInInterpolation enforcement
Remove superfluous #to_s usage in interpolated strings
Rubocop: allow DeprecatedClassMethods enforcement
Replace "deprecated" class method File.exists? with .exist?