#12 Make page changes work with history

[Peter Warden]

At the moment, if you hit the back button on most browsers, you end up
seeing the page before you entered SearchMash, rather than going
through the search result page changes you've done within the site during
searching.

Ideally, all search page changes should get added to the browser history.
This means that when you enter your search on the main page, see the
first page of results, and go through several pages, subsequent clicks of
the back button should return you to the previous result page.

It should also apply if you leave the site, clicking back from an external
link should restore you to the last page of search results you were on
before you left.

Keeping the URL of the search page for each history entry should be
enough, reloading and checking the links within is acceptable when going
through the history.