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/switch.sh

@@ -0,0 +1,51 @@
+#!/bin/sh
+
+#move to script directory so all relative paths work
+cd "$(dirname "$0")"
+
+#includes
+. ./config.sh
+
+verbose "Installing FreeSWITCH"
+
+if [ .$switch_source = .true ]; then
+	if [ ."$switch_branch" = "master" ]; then
+		switch/source-master.sh
+	else
+		switch/source-release.sh
+	fi
+
+	#copy the switch conf files to /etc/freeswitch
+	switch/conf-copy.sh
+
+	#set the file permissions
+	switch/source-permissions.sh
+
+	#sysvinit service
+	switch/source-sysvinit.sh
+fi
+
+if [ .$switch_package = .true ]; then
+	if [ ."$switch_branch" = "master" ]; then
+		if [ .$switch_package_all = .true ]; then
+			switch/package-master-all.sh
+		else
+			switch/package-master.sh
+		fi
+	else
+		if [ .$switch_package_all = .true ]; then
+			switch/package-all.sh
+		else
+			switch/package-release.sh
+		fi
+	fi
+
+	#copy the switch conf files to /etc/freeswitch
+	switch/conf-copy.sh
+
+	#set the file permissions
+	switch/package-permissions.sh
+
+	#sysvinit service
+	switch/package-sysvinit.sh
+fi