gaedev: pass env vars from .env to dev_appserver.py

gaedev.bash

function gaedev() {
  env_vars_args=""

  if [ -f '.env' ]; then
    echo "> Using .env file:"
    # indent the env to look nicer
    perl -pe's/^/  /' <.env
    echo
    env_vars_args=$(perl -pe's/^(export )?/--env_var /' <.env | perl -pe's/\n/ /')
  else
    echo "> No .env file found."
    echo
  fi

  cmd="dev_appserver.py . --enable_console --log_level=debug --storage_path=/tmp/dev_appserver.$(basename $(pwd)) ${env_vars_args} $*"
  echo "${cmd}"
  echo

  $cmd
}
export -f gaedev