Added Config and Reload Command

Added a Config file and a command to reload it, and added the ability to
toggle Guard item dropping in the config. Initially, the config checker
statement surrounded the event register line, but I moved it to the
actual listener class to allow plugin-specific config reloading. Also
added a small amount to README file
Added DeathListener and twiddled Config-y things

Added a Listener to prevent Guards from dropping items on death, split
config options into finer variables and made reload command create
default config file if it doesn't already exist