Add date validation for Days.

[plomtask] / scripts / setup_dev_environment.sh

#!/bin/sh
set -e

if [ ! -d '.git' ]; then
  echo "Cannot find .git/, please run me from your cloned repo's top directory!" 
fi

pip install -r requirements.txt

if [ ! -f '.git/hooks/pre-commit' ]; then
  echo 'Linking pre-commit hook.' 
  cd .git/hooks/
  ln -s ../../scripts/pre-commit
fi