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
Python 3 compatibility fix
Whitespace fix
Merge pull request #31 from melvyn-sopacua/master

Python3 compatibility fix
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
update page template in example progect with code box
update readme with the demo page
Allow setting of initialDate via options

This determines the default date and time that is selected on the widget
as the user browses through the levels.
Refactor code to different structure

Instead of using a MultiWidget with only a single widget, we refactor to
put the picker functionality in a Mixin class which can then be
inherited from, along with the desired widget type (DateTimeInput,
DateInput or TimeInput.)

This approach is used because we're not really creating a MultiWidget
but rather a specialised version of the normal Date/Time/DateTimeInput
widgets.

I think the advantages of the refactor are:

- We don't have to worry about extracting the values from the widgets.
- We don't have to decompress a value list.
- The localisation is handled entirely in the constructor with more
  comments about what is going on and relying on class level format
  specifiers and names to handle the differences between the different
  widget types
- The template strings use '%(name)s' style specifiers instead of a long
  ordered list of arguments.
- Almost all the datetime picker options are optional. You can include
  as many as you like and use numbers or strings for the ones which
  accept both. Strings are automatically quoted.
- There are more comments explaining what is going on.
Merge branch 'options'