Fixed mouse wheel scrolling exception; bug in guichan-sfml
Weapon text sort of working; needs design work
Fixed letter casing for weapons
Fixed weapon issue; weapon granting working for the most part
Making hero invincible after boss death
Showing boss names after selected + game config

Changed game config to include a boss to weapon map, which dictates
which boss enables which weapon slot(s). This allows a single boss
defeat to unlock more than one weapon slot.
Showing the letters of the name individually
Merge pull request #190 from zackthehuman/master

More work on stage select and weapon get