Add hook for altering menu names

In a project that I'm working I'm using this module to automatically create menus for the different domains that are part of the multi-site installation. Bu there are some troubles when working with sub-domains while developing.

For example, I'm using dev.example.com and dev.otherexample.com to develop the sites that will be migrated from the originals example.com and otherexample.com.

The main problem is that this modules uses parts of the domain to create hash that identifies each menu automatically created, so, when other developer try to load my changes and uses other name for the site (like dev2.example.com) the whole thing starts to fail.

Of course, I did some research before ask get rid the md5 hash generation. And I fully understand what is the reason to create a key based on the machine name of the menu and the machine name of the domain where the menu is created.

And because the menu name generated based on the machine name and the domain machine name seems to be the more reasonably way to identify a menu. I would like at least suggest some changes that will allow developers to get more control in the way that the hash is defined.

So the following patch will at least give a change to alter the hash generation to have more control about what is being created in each environment.