Merge pull request #175 from AndreLesa/zhcard_dev

date correction on filters.
date fix
Merge branch 'zhcard_dev' of https://github.com/mwana/mwana into zhcard_dev
Added has_quit field to contact model.
Added quit keyword and code.
Merge pull request #176 from AndreLesa/quit_keyword

Quit keyword
Merge pull request #7 from mwana/zhcard_dev

Zhcard dev