Update signin.rb

The newlines were breaking Ruby 1.8.7, changing server-side to separate template substitutions onto single-line substitutions.
Update signin.rb

Removing client secret from template
Merge branch 'master' of github.com:gguuss/gplus-quickstart-ruby into gguuss-master

Conflicts:
	signin.rb
Merge pull request #5 from cartland/master

Merged #3 and #4.