#206 improved object overview pages
also improved layout of custom object tabs
#206 improved styling, removed self-created css-classes and replaced them with bootstrap
Implemented panels (object details, reference tree).
Set default column title to 'Name' as long as there is no column title given in filterable-tree directive
#64 removed unused controller
#266 fixed bug
#213 implemented jump from reference-tree when clicking another object (e.g. uiAction) and redirect to reference-tree again
#216 removed temporary fix
#267 prepared but not finished fixing unit-tests