Moved install to install/main

Tried to prevent us having too many files in a single directory.  This layout
feels a bit more natural.
Change item.name to item.vhost. Fix #31

Since the dict option is `vhost` it make more sense for this hash item
to be named like that.

Note that it was previously named like that, but it changed silently in
a commit before. So I consider this a bug.
Fix the way the Redhat installation is included
Add a test to ensure RabbitMQ is listenning to the good port by default
Bump version number