change default installation directory from /etc to /opt since it's more appropriate location

sample.xo-install.cfg

@@ -5,7 +5,7 @@
 PORT="80"
 
 # Base dir for installation and future updates
-INSTALLDIR="/etc/xo"
+INSTALLDIR="/opt/xo"
 
 # Configuration is stored in XOUSER's home directory and by default will be overwritten with every update done by this script. Set CONFIGUPDATE to false if you don't want this to happen
 CONFIGUPDATE=true

xo-install.sh

@@ -19,7 +19,7 @@ source $CONFIG_FILE
 
 # Set some default variables if sourcing config file fails for some reason
 PORT=${PORT:-80}
-INSTALLDIR=${INSTALLDIR:-"/etc/xo"}
+INSTALLDIR=${INSTALLDIR:-"/opt/xo"}
 BRANCH=${BRANCH:-"master"}
 LOGFILE=${LOGFILE:-"$(dirname $0)/xo-install.log"}
 AUTOUPDATE=${AUTOUPDATE:-"true"}