See symfony-cmf/block-bundle#78

Some suggestions:

• Use dots as seperator for groups
• The vendor name is the first group and the second group is the bundle name (e.g. fos.user instead of fos_user)
• The classname should be stored in a parameter which name follows %service name%.class. (e.g. cmf.block.templating.helper.class)
• Use lowercase letters (symfony will convert them to lowercase anyway)
• Use underscored-group names.