Local changed to Vagrantfile configuration

[nuncanada]

Adding support to changes of the Vagrantfile configuration thru a local Vagrantfile with special functions

[hardyoyo]

Sorry, I just noticed this PR. I like the looks of it, it would be handy to have an override of the Vagrantfile, though you'd have to balance your desire with being clever with a local override, with the needs of the community: maybe your clever hack is just a new feature awaiting you to make a pull request. Lecture over. :-) I haven't tested this, but will, soon.