Use global spinner

As implemented in https://github.com/Rise-Vision/rv-loading/pull/9

- Add the missing ngEnter directive
- Show spinner when loading companies in Company Selector dialog

Fix for https://github.com/Rise-Vision/common-header/issues/214,
https://github.com/Rise-Vision/common-header/issues/202
Merge pull request #223 from settinghead/master

Use global spinner