Fixed __unicode__() method behavior.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Applied list_display at PlanActual admin list view.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Fixed to remove old venv.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Fixed missing-docstring violation of 0001_initial.py

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>