Merge Release-0.0.4 into develop
Add rubocop development dependency to gday.gemspec
Add rubocop to Rakefile
Create .rubocop.yml

Include files:
Rakefile
*.gemspec
Update files with single quotes as recommended by rubocop
Update files with space after # as recommended by rubocop
Update regular expressions in gemspec file as recommended by rubocop

Use %r only for regular expressions matching more than 1 '/' character
Add comment at top of Rakefile to disable rubocop HashSyntax check
Update gemspec to use $INPUT_RECORD_SEPARATOR instead of $/

$INPUT_RECORD_SEPARATOR is provided by the English library.
Add require 'English'
Add module documentation to version.rb file
Bump to 0.0.5
Release-0.0.5 - use coding standard (Ruby Style Guide)

Use rubocop to check code against Ruby Style Guide.
Add rubocop to Rakefile and gemspec.
Create .rubocop.yml.
Modify code as recommended by rubocop.