Add 'bundler' as a Gem dependency
Add 'bundler' as a Gem dependency

Without this, the generated ruby file fails with:
```
$ ./ssl_autoscale-STAN-1574.rb
/System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require': cannot load such file -- bundler/setup (LoadError)
	from /System/Library/Frameworks/Ruby.framework/Versions/2.0/usr/lib/ruby/2.0.0/rubygems/core_ext/kernel_require.rb:55:in `require'
	from ./ssl_autoscale-STAN-1574.rb:3:in `<main>'
```
After I installed the "bundler" gem manually the error was gone and I got the expected Usage message.
FluidInc/cloudformation-ruby-dsl,johnlabarge/cloudformation-ruby-dsl