Having multiple tabs of the Reseller UI open causes quirky session behavior

Quirky behavior found:

-logging out of one tab does not cause the other tab(s) to automatically log out (it should)

-session expiration warning dialog is not synced between tabs; this is caused because the tabs share the browser session but each tab gets its own session timer.. to resolve the session timer needs to figure out its timeout time from the browser session (currently it's hardcoded)

-browser session stores last page and is shared between tabs; instead, GWT should use its history mgmt to figure out the last page so its not shared between tabs (ie. tab1 is on QUOTES page, then tab2 is opened and goes to MERCHANTS page, then tab1 is refreshed and brought to MERCHANTS - should stay on QUOTES)