New lab Twitter feed (@slimsuite)

In line with the general retirement of SeqSuite in favour of bundling everything together in SLiMSuite, the old @seqsuite twitter account is also being retired. In its place is a new Edwards Lab account with the twitter handle @slimsuite. The tweeting remit will also be broadened to include a variety of lab-related activities, not just SLiMSuite-related matters.