Requirements.txt and travis integration added!

Squashed commit of the following:

commit 95373e2fec86243736115cc18632bdfe3a87637f
Author: Dawid Pura <puradawid@gmail.com>
Date:   Sat Apr 5 08:00:36 2014 +0200

    django_cron as requirement added

commit c5bd085f522eea1f699508f51a0d2863670c3a55
Author: Dawid Pura <puradawid@gmail.com>
Date:   Sat Apr 5 07:53:14 2014 +0200

    Travis now can build and run tests

commit d83a96e61c16a07195963bfe2743f5e32e7c2d0a
Author: Dawid Pura <puradawid@gmail.com>
Date:   Sat Apr 5 07:52:14 2014 +0200

    pip requirements added