Enabled fallback controller resolution

- Based on parent node type hierarchy, if there exists no corresponding
  controller for the target node type.
Various changes

-todo: Review and test
Refined node mapping
Added docs
Added logo
Fixed test
Fixed tests
Adapeted default resource page to new API
Merge pull request #1 from dantleech/fallback_controller

[POC] Enabled fallback controller resolution
Removed slinp:resource restriction

- Also redirect nt resources to slinp resources
Merge pull request #7 from dantleech/remove_resource_nt

Removed slinp:resource restriction