Shared parameters.yml by default

Is there a reason, why the `parameters.yml` isn't shared by default? I had a huge problem setting up a server _without_ the parameters file shared, when I noticed, that it isn't really useful to keep it release-dependent. Also it would allow to think about a builtin solution for the setup, that is currently solved using a custom solution within the deploy script [1], or manually.

Maybe I could try provide a PR, but I'd like to hear some feedback first :smile: 


[1] http://capifony.org/cookbook/upload-parameters-file.html