Add pear modules, mail and net_smtp via composer (#93)

Add pear modules, mail and net_smtp via composer, remove php 5.6 build due to phpunit 6

lib/composer/vendor/consolidation/config/tests/scripts/install-scenario

@@ -0,0 +1,23 @@
+#!/bin/bash
+
+SCENARIO=$1
+ACTION=${2-install}
+
+dir=dependencies/${SCENARIO}
+if [ -z "$SCENARIO" ] ; then
+  SCENARIO=default
+  dir=.
+fi
+
+
+if [ ! -d "$dir" ] ; then
+  echo "Requested scenario '${SCENARIO}' does not exist."
+  exit 1
+fi
+
+echo "Switch to ${SCENARIO} scenario"
+
+set -ex
+
+composer -n --working-dir=$dir ${ACTION} --prefer-dist --no-scripts
+composer -n --working-dir=$dir info