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/phpunit-mock-objects/tests/_fixture/AnInterface.php

@@ -1,4 +1,5 @@
 <?php
+
 interface AnInterface
 {
     public function doSomething();

lib/composer/vendor/phpunit/phpunit-mock-objects/tests/_fixture/ClassWithAllPossibleReturnTypes.php

@@ -0,0 +1,56 @@
+<?php
+class ClassWithAllPossibleReturnTypes
+{
+    public function methodWithNoReturnTypeDeclaration()
+    {
+    }
+
+    public function methodWithVoidReturnTypeDeclaration(): void
+    {
+    }
+
+    public function methodWithStringReturnTypeDeclaration(): string
+    {
+        return 'string';
+    }
+
+    public function methodWithFloatReturnTypeDeclaration(): float
+    {
+        return 1.0;
+    }
+
+    public function methodWithIntReturnTypeDeclaration(): int
+    {
+        return 1;
+    }
+
+    public function methodWithBoolReturnTypeDeclaration(): bool
+    {
+        return true;
+    }
+
+    public function methodWithArrayReturnTypeDeclaration(): array
+    {
+        return ['string'];
+    }
+
+    public function methodWithTraversableReturnTypeDeclaration(): Traversable
+    {
+        return new ArrayIterator(['string']);
+    }
+
+    public function methodWithGeneratorReturnTypeDeclaration(): Generator
+    {
+        yield 1;
+    }
+
+    public function methodWithObjectReturnTypeDeclaration(): object
+    {
+        return new Exception;
+    }
+
+    public function methodWithClassReturnTypeDeclaration(): stdClass
+    {
+        return new stdClass;
+    }
+}

lib/composer/vendor/phpunit/phpunit-mock-objects/tests/_fixture/TraversableMockTestInterface.php

@@ -1,4 +1,5 @@
 <?php
-interface TraversableMockTestInterface extends Traversable
+
+interface TraversableMockTestInterface extends \Traversable
 {
 }