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/phar-io/version/composer.json

@@ -0,0 +1,34 @@
+{
+  "name": "phar-io/version",
+  "description": "Library for handling version information and constraints",
+  "license": "BSD-3-Clause",
+  "authors": [
+    {
+      "name": "Arne Blankerts",
+      "email": "arne@blankerts.de",
+      "role": "Developer"
+    },
+    {
+      "name": "Sebastian Heuer",
+      "email": "sebastian@phpeople.de",
+      "role": "Developer"
+    },
+    {
+      "name": "Sebastian Bergmann",
+      "email": "sebastian@phpunit.de",
+      "role": "Developer"
+    }
+  ],
+  "support": {
+    "issues": "https://github.com/phar-io/version/issues"
+  },
+  "require": {
+    "php": "^5.6 || ^7.0"
+  },
+  "autoload": {
+    "classmap": [
+      "src/"
+    ]
+  }
+}
+