Adjusted the range parameter value to be a little easier to parse, fixes
Squashed commit of the following:

commit a00e8c36c714c75f395682f28eb0cde53f3b1714
Author: Joerg Sonnenberger <joerg@bec.de>
Date:   Tue Sep 17 15:03:13 2013 +0200

    Allow dojo/store/JsonRest to be more client-side cache friendly.

    At least Firefox and Chrome won't cache requests with Range header set
    nor do they like answers with Content-Range. Make it possible to provide
    the desired range by query parameter rangeParam and check for
    X-Content-Range as well.