feat(app:routing): improve app routing

Changes:
- Use `ui-sref` instead of `href` or `ng-href` when ui-router is chosen
- Use `ui-sref-active` instead of `ng-class='{active: isActive()}'` when ui-router is chosen
- Use `$state.go()` where applicable, when ui-router is chosen
- Use `$scope.menu[n].state` instead of `$scope.menu[n].link` when ui-router is chosen (attempt to remove possible confusion)
- Omit `$scope.isActive` when ui-router is chosen
- Simplify `navbar(jade).jade` templating (remove extra `<% if (filters.auth) %>` tag)
- Return `$promise` from `Auth.isLoggedInAsync`, to be used in route resolves
- Add `/logout` route for both ng-route and ui-router
- Use `$routeChangeStart` or `$stateChangeStart` to pass refering route or state to `/logout`
- Add `stateMock` for testing `$state` transitions
- Use `stateMock` in main.controller for expecting template requests from state transistions

Closes #331