Fixes to work with PHPUnit 3.6 and PHP 5.3

[shupp]

• Throw/Expect new WebDriver_Exception instead of Exception
• Add default $six_hex value of null to eliminate warnings
  (which become exceptions in PHPUnit's error handling)
• Use preg_split() instead of the deprecated split() to eliminate
  deperecation warnings
• Expect PHPUnit_Framework_ExpectationFailedException when appropriate

[openprivacy]

Thank you, this is just what I needed. With PHPUnit 3.6.10 and PHP 5.5.3 (on Xubuntu 13.10) this patch mostly worked, with one exception changed:

diff --git a/WebDriverColorTest.php b/WebDriverColorTest.php
index 0c93a31..ba26bc2 100644
--- a/WebDriverColorTest.php
+++ b/WebDriverColorTest.php
@@ -39,7 +39,7 @@ class WebDriverColorTest extends PHPUnit_Framework_TestCase {

   /**
    * @dataProvider invalid_colors
-   * @expectedException Exception
+   * @expectedException PHPUnit_Framework_Error_Notice
    */
   public function test_invalid_colors($input) {
     WebDriver::CanonicalizeCSSColor($input);

I noticed also that the maintainer already updated split() -> preg_split(), but did not merge the rest of this patch.