Rewrite gever setup

  - Introduce two zcml directives to configure deployments and ldap profiles.
  - Simplify deloyment form, remove multi-client configuration options.
  - Add custom setuphandlers for local roles, initial repository and document templates.
  - Configure development options and add environment variable to enable them easily.
  - Update branding, add onegovgever logo.

Closes #368
I'm not a fan of an specific `profiles.zcml`, could you move them to the `configure.zcml` ? 

@lukasgraf @deiferni or what you think ?