Replace default angular routing with ui-router #4
Description
Currently, when user selects a problem, the whole problems list is being reloaded as well as the problem area.
Currently it's not possible not to reload this list, but ui-router library has necessary facilities for doing this.
All requests to problems and problem lists are cached, so current behavior doesn't increase server load.
But user experience is a little weird: the screen 'jumps' every time the page is reloaded.