Added PHAR creation

phar/README

+The buildphar.php will generate a solarium.phar PHAR file that is ready for distribution.

phar/buildphar.php

+<?php
+
+// Create a new htrouter phar file
+@unlink('solarium.phar');
+$phar = new Phar('solarium.phar', 0, 'solarium.phar');
+
+$phar->setStub(file_get_contents("stub.php"));
+
+$basePath = realpath(__DIR__."/../library/Solarium");
+$phar->buildFromDirectory($basePath, '/\.php$/');
+
+

phar/stub.php

+<?php
+Phar::mapPhar("solarium.phar");
+require_once 'phar://solarium.phar/Autoloader.php';
+Solarium_Autoloader::register();
+
+__HALT_COMPILER();
+?>