init does not validate package names properly

Created by: BrianOtto

When I run ./pmbootstrap.py init it asks me what packages I want to install. If I enter any package name with a + (plus sign) or a . (period) then I will get a validation error.

e.g.

Extra packages [none]: g++,cmake,gtk+2.0-dev,git
ERROR: Input did not pass validation (regex: ^(|[-\w\s]+(?:,[-\w\s]*)*)$). Please try again.

It's a pretty simple change to the regex in pmb/config/init.py to support this. I have it fixed on my local copy and will commit it to a PR tonight.

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