Backport BaseGeometryWidget and GeometryField on Django < 1.6
Pyflakes/pep8 cleanup
Enable Leaflet widget tests for Django < 1.6
Update README about Leaflet widget for Django < 1.6
Fix Python 3 support in Leaflet widget for Django >= 1.4.2 and < 1.6
Merge pull request #63 from gutard/geometry_forms_backport

Backport BaseGeometryWidget and GeometryField on Django < 1.6