Add basic unit testing. re #96

.travis.yml

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+language: php
+php:
+  - 5.5
+  - 5.4
+  - 5.3

phpunit.xml

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+<phpunit>
+  <testsuites>
+    <testsuite name="COPS">
+      <directory>test</directory>
+    </testsuite>
+  </testsuites>
+</phpunit>

test/baseTest.php

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+<?php
+
+require_once (dirname(__FILE__) . "/config_test.php");
+require_once (dirname(__FILE__) . "/../base.php");
+
+class StackTest extends PHPUnit_Framework_TestCase
+{   
+    public function testAddURLParameter ()
+    {
+        $this->assertEquals ("?db=0", addURLParameter ("?", "db", "0"));
+        $this->assertEquals ("?key=value&db=0", addURLParameter ("?key=value", "db", "0"));
+        $this->assertEquals ("?key=value&otherKey=&db=0", addURLParameter ("?key=value&otherKey", "db", "0"));
+    }
+}

test/config_test.php

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+<?php
+
+$config = array();
+$config['default_timezone'] = "Europe/Paris";