Add some rudimentary tests

Makefile

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+test:
+	phpunit --bootstrap tests/bootstrap.php tests

tests/ActionDateCTest.php

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+<?php
+
+class ActionDateCTest extends PHPUnit_Framework_TestCase {
+    function testDecode() {
+        $action = new ActionDateC("1374772515");
+        $expected = [1374772515 => '2013-07-25T17:15:15+00:00'];
+        $this->assertEquals($expected, $action->decode());
+    }
+
+    function testDecodeHasCorrectNumberOfResults() {
+        $action = new ActionDateC("1374772515\n1374772516");
+        $this->assertCount(2, $action->decode());
+    }
+}

tests/ActionQuotedPrintableDecodeTest.php

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+<?php
+
+class ActionQuotedPrintableDecodeTest extends PHPUnit_Framework_TestCase {
+    function testDecode() {
+        $action = new ActionQuotedPrintableDecode('a=3Db');
+        $this->assertEquals('a=b', $action->decode());
+    }
+}

tests/ActionQuotedPrintableEncodeTest.php

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+<?php
+
+class ActionQuotedPrintableEncodeTest extends PHPUnit_Framework_TestCase {
+    function testDecode() {
+        $action = new ActionQuotedPrintableEncode('a=b');
+        $this->assertEquals('a=3Db', $action->decode());
+    }
+}

tests/bootstrap.php

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+<?php
+
+date_default_timezone_set('UTC');
+
+require_once 'dBug.php';
+require_once 'classes.php';
+require_once 'functions.php';