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/gettext/languages/bin/export-plural-rules

@@ -0,0 +1,4 @@
+#!/usr/bin/env php
+<?php
+
+include 'export-plural-rules.php';

lib/composer/vendor/gettext/languages/bin/export-plural-rules.bat

@@ -0,0 +1,8 @@
+@echo off
+
+if "%PHPBIN%" == "" set PHPBIN=@php_bin@
+if not exist "%PHPBIN%" set PHPBIN=%PHP_PEAR_PHP_BIN%
+if not exist "%PHPBIN%" set PHPBIN=php
+set MY_BIN_FOLDER=@bin_dir@
+if not exist "%MY_BIN_FOLDER%" set MY_BIN_FOLDER=%~dp0
+"%PHPBIN%" "%MY_BIN_FOLDER%\export-plural-rules" %*

lib/composer/vendor/gettext/languages/bin/export.cmd

@@ -1,3 +0,0 @@
-@echo off
-
-php "%~dpn0.php" %*

lib/composer/vendor/gettext/languages/bin/export.sh

@@ -1,3 +0,0 @@
-#!/bin/sh
-
-php "$(dirname -- "$0")/export.php" $@