Do not mandate _ in interface names

This adds compatibility with modern namespaced projects.
remove Zend.NamingConventions.ValidVariableName.PrivateNoUnderscore

This sniff is getting removed since it clashes with generated entities
from doctrine2 in the new symfony projects.
bump version to 1.0.0 stable

This should have been done earlier...
Merge pull request #2 from libgraviton/symfony

Symfony Support