[#761] Draft version of Ajax post requests on MyRSR page

First implementation of the Ajax post requests. There's still work to do on the UI part, e.g.:
- How (long) do we show notifications of a success or fail?
- Add a loading icon when an Ajax call is in process
[#761] Removed AJAX test view
[#761] Fix conflicts
Merge branch 'feature/761_ajax_controls' into feature/rsr_v3