Add *.dump.sql to gitignore.
Change security config to be switchable between ldap and demo.

* There are now two authentication managers in two different files
  available: ldap and demo (containing simple test user).
* To choose which type of authentication should be used, the system
  property 'authentication.type' must be set either to 'ldap' or to
  'demo'.
Clean up usage of role names.
Change roles of demo test user.
Format pom.xml
Clean up pom.
Integrate liquibase + add insert test user changelog for demo.