GUI-293: Flag XHR requests from AngularJS with the proper header to let Pyramid handlers properly leverage the requests.is_xhr flag.
Note: This needs to be explicitly enabled for all $http.get/$http.post operations in Angular per issue 2366 - https://github.com/angular/angular.js/issues/2366
GUI-293: Handle invalid token or session timeout errors in XHR calls.
Fix broken auth unit tests.
Remove duplicate string template.
Merge pull request #118 from eucalyptus/GUI-293

GUI-293: Better handling of 403 errors via XHR calls.
GUI-332: Don’t display blank (“select…”) choice for multi-select Chosen widget in scaling group wizard.
Add search_contains param to all Chosen widgets for better filtering UX.
Merge pull request #119 from eucalyptus/GUI-332

GUI-332: Fix multi-select Availability Zone Chosen widget in Scaling Group wizard
Display error response from backend when IP address allocation fails.
GUI-197: Display instance info as “Name (ID)” format in the disassociate from instance modal.
Merge pull request #120 from eucalyptus/GUI-197

GUI-197: Misc fixes for IP Address pages
Merge branch 'develop' into GUI-196-reverse