Require enum34 if running under old Python

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Implement generation of META-INF/container.xml

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>
Add TODO file

Signed-off-by: Mikhail Gusarov <dottedmag@dottedmag.net>