Exhibit history mechanism inappropriately clears query portion of url

[karger]

When exhibit's query mechanism initializes it erases the query-string part from the url, which makes it impossible to reload the page you just loaded.

As part of its initialization, Exhibit.History identifies the original document location as
Exhibit.History._originalLocation = Exhibit.Persistence.getURLWithoutQueryAndHash();
then during initialization it invokes pushState() which sets
url = Exhibit.History._originalLocation;
and then passes url to history.pushState, which updates the location to url, thus erasing the query string.