Fix #152. Move menu creation to Menu_Registry.

- Move registration of resource menue from controllers to menu-registry
- Introduce context param for getMenu and setMenu to allow the same menu in different context, e.g. resource-menu for different resources
- If resource entry has class Model send a model parameter
- If the css class of the dom node ist Model send model-paramter instead of resource-parameter to the service/menu action
- Change order of insertion to append
Merge pull request #250 from AKSW/feature/improveResourceMenu

Fix #152. Move menu creation to Menu_Registry.

Due to the changes in `extensions/themes/silverblue/scripts/support.js` you have to make sure, that the browser reloads this JS file after updating. If it is not reloaded you will see the menu for resources on models instead of the model-menu.