Change default vhost to not include a slash and other readme fixes

Commits are self explanatory, in a nutshell;

Readme:
- unquoted some boolean values in the examples

init.pp:
- Removed the '/' from the default rabbit vhost name, isn't needed and vhosts shouldn't have a / in them.
- Caused rabbitmq to fail talking to sensuAPI in my case until i overrode in hiera with 
sensu::rabbitmq_vhost: "sensu"