library: rcfile: Try $USERPROFILE if $HOME is empty
library: rcfile: Try $USERPROFILE if $HOME is empty

Windows by default does not have a HOME envvar. USERPROFILE is the same
as HOME on Linux. Typically on win7 it is "C:\Users\yourusername".

closes #22

cernekee/stoken,cernekee/stoken,cernekee/stoken,cernekee/stoken