fixed date format, added default date, update Banner table to "date"
instead of datetime
special offer & banner, changed display format to dd/mm/yyyy to fix out of
range error when selecting date
updated sql for SpecialOfferBanner, changed data type to 'date'
Merge pull request #302 from tonyrd/master

fixed errors, changed date format to dd/mm/yyyy, changed to "date" data type