Updated version and change log

Updated version and change logs.

Updated change log and version number.

Updated change logs and version.

Updated version number and change logs.

Allow for Cart subclasses to set 'queryset' without overriding 'get_q…

…ueryset'.

No need to set 'prodct_model' if 'queryset' is set.

Updated version number and change logs.

Updated change log and version.

Updated release notes.

Updated version number and release notes.