do_backup now takes parameter
fixed some whitespace issue.
dont' check for function declaration

that was a bad feature idea on my part... you can re-declare any
functions in mcwrapper.conf and they'll override.
use $() notation. added comments
use $() rather than ``
more concise checks for if server is running
created new is_minecraft_running function
is_minecraft_running takes a param, now
made errcho function into 'warn'

replaced all stderr echos with warn.
code cleanup.