installation script for OS Devuan (#95)

* adding devuan

* add devaun desc to README
make update and upgrade more noisy
correct path for devuan in pre-install

* some untested code for the source install - source installation is broken in Debian installation script and I have not debugged the problem. Focusing on the packaged version first.

devuan/resources/colors.sh

@@ -0,0 +1,25 @@
+#!/bin/sh
+
+verbose () {
+	echo "${green}$1${normal}"
+}
+error () {
+	echo "${red}$1${normal}"
+	}
+warning () {
+	echo "${yellow}$1${normal}"
+}
+
+# check for color support
+if test -t 1; then
+
+    # see if it supports colors...
+    ncolors=$(tput colors)
+
+    if test -n "$ncolors" && test $ncolors -ge 8; then
+        normal="$(tput sgr0)"
+        red="$(tput setaf 1)"
+        green="$(tput setaf 2)"
+        yellow="$(tput setaf 3)"
+    fi
+fi