ffwizard-berlin: support vap parameter of community profile

Some communities don't want an additional virtual access point. ffwizard-berlin
now supports the 'vap' parameter in community.profile. To prevent the creation
of an additional access point put "option 'vap' '0'" in the community section.
Merge pull request #12 from freifunk-berlin/feature/vap_config_parameter

ffwizard-berlin: support vap parameter of community profile