Add view for mapping roles to LDAP groups
Add LdapRealm authentication functions

#52
Fix a few view-related bugs regarind group names and deleting groups
Remove POST from delete action in LdapRoleController
Fix issues with RoleMappingService
Fix runtime error with RoleMappingService and Shiro Filters
Clean up view code in list.gsp
Merge pull request #58 from metridoc/pull_role_mapping_2

Pull role mapping 2