Fix nav arrows in linker browse showing entity string (changed to text); Also fixed browse navigation that was broken for the bottom row nav links;
Handle session errors for ajax requests; Allow login form to be displayed on homepage via param ?login=true;
Merge pull request #271 from hudmol/linker-browse-bugs

[Delivers #43517753 #43798975] Fix bugs in the linker browse dialog pagination
Merge pull request #272 from hudmol/inline-messages-for-session-errors

The ?login=true functionality looks nice.
report an error when trying to add a nonexistent user to a group
Register 'group_members' path with the form helper by calling 'id_for' so error messages for that field link up
Merge branch '43514895-groups-and-nonexistent-users' of github.com:hudmol/archivesspace into 43514895-groups-and-nonexistent-users