Updated contribution guidelines

Because I think you want people issuing pull requests to `develop`
rather than `master` :)
Merge pull request #21 from jimr/develop

Updated contribution guidelines
Make this work on Django 1.3
Merge pull request #26 from ionelmc/master

 Make this work on Django 1.3
update datetimepicker to the last version and now works with Bootstrap version 2 and 3 FIX #20
new DateWidget and TimeWidget CLOSE #20 #16 #17 FIX #24
update package version and README
add dateTimeExample django project
redirect to default page in example
merge with master branch
update topic for pypi