implemented contact twig extension
fixed service definition
fixed tests
correcte twig function name to match twig conventions
Merge branch 'hotfix/resolve-user-id' into develop

Conflicts:
	Resources/config/services.yml
Merge pull request #136 from sulu-cmf/bugfix/minor-bugfixes

[BUGFIX] fixed various bugs
Merge branch 'develop' of git://github.com/sulu-cmf/SuluContactBundle into bugfix/minor-bugfixes-part2