removed duplicated entry from the README.rst

See #1189
Merge pull request #1194 from ostcar/jsonfield

removed duplicated entry from the README.rst
Fixed #1195: Correct path to circle.png on ballot paper (assignment and motion).
Move projector.models.ProjectorSlide to core.models.CustomSlide
Fixed #1177 and #1209: Added new requirments for portable: setuptools (pkg_resources) and jsonfield.
Merge pull request #1196 from emanuelschuetze/fix-1195

Fixed #1195: Correct path to circle.png on ballot paper (assignment and ...
Merge pull request #1208 from ostcar/customslide

Move projector.models.ProjectorSlide to core.models.CustomSlide