Updated development in README.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Ignored no-init warning of pylint.

Signed-off-by: Kouhei Maeda <mkouhei@palmtb.net>
Ignored egg-info directories.

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