Update HtmlToolbarHelper to use ‘sha1’ for the explain_sql hash

- View/Helper/HtmlToolbarHelper was updated to use ‘sha1’ for the explain_sql hash, but the controller is still using the system default.  If this default is something other than ‘sha1’, the call will fall because the hashes will not match
Merge pull request #133 from arclyte/master

Update HtmlToolbarHelper to use ‘sha1’ for the explain_sql hash