preperation for spliting into multiple files

Signed-off-by: Mattias Andrée <maandree@operamail.com>
ponysay.py => __main__.py

Signed-off-by: Mattias Andrée <maandree@operamail.com>
splitting into multiple files

Signed-off-by: Mattias Andrée <maandree@operamail.com>
add imports

Signed-off-by: Mattias Andrée <maandree@operamail.com>