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/phpunit/php-timer/README.md

@@ -6,13 +6,13 @@ Utility class for timing things, factored out of PHPUnit into a stand-alone comp
 
 ## Installation
 
-To add this package as a local, per-project dependency to your project, simply add a dependency on `phpunit/php-timer` to your project's `composer.json` file. Here is a minimal example of a `composer.json` file that just defines a dependency on PHP_Timer:
+You can add this library as a local, per-project dependency to your project using [Composer](https://getcomposer.org/):
 
-    {
-        "require": {
-            "phpunit/php-timer": "~1.0"
-        }
-    }
+    composer require phpunit/php-timer
+
+If you only need this library during development, for instance to run your project's test suite, then you should add it as a development-time dependency:
+
+    composer require --dev phpunit/php-timer
 
 ## Usage
 
@@ -21,8 +21,6 @@ To add this package as a local, per-project dependency to your project, simply a
 ```php
 PHP_Timer::start();
 
-$timer->start();
-
 // ...
 
 $time = PHP_Timer::stop();