Defined core 'Character' class

Character objects are going to be important,
obviously. This commit defines the class and
incorporates it into the character_builder.
I will create similar classes for things like
weapons, skills, spells, items, etc. etc. I
think I am passed the mock-up phase and will
try to use real objects for things going
forward.

I also added a cleanup.sh for pyc files. They
just annoy me and I'm paranoid about
fat-fingering 'rm *.pyc'. Not that it would be
a big deal if I did thanks to git...