[2.0] Missing files from last commit.

lib/Doctrine/Common/CommonException.php

+<?php
+
+namespace Doctrine\Common;
+
+/**
+ * Base exception class for package Doctrine\Common
+ * @author heinrich
+ *
+ */
+class CommonException extends \Exception {
+}
\ No newline at end of file

lib/Doctrine/ORM/Proxy/ProxyException.php

+<?php
+
+namespace Doctrine\ORM\Proxy;
+
+class ProxyException extends Doctrine\ORM\ORMException {
+
+    public static function proxyDirectoryRequired() {
+        return new self("You must configure a proxy directory. See docs for details");
+    }
+
+    public static function proxyNamespaceRequired() {
+        return new self("You must configure a proxy namespace. See docs for details");
+    }
+
+}
\ No newline at end of file

lib/Doctrine/ORM/Tools/Export/ExportException.php

+<?php
+
+namespace Doctrine\ORM\Tools\Export;
+
+class ExportException extends ORMException {
+    public static function invalidExporterDriverType($type) {
+        return new self("The specified export driver '$type' does not exist");
+    }
+
+    public static function invalidMappingDriverType($type) {
+        return new self("The mapping driver '$type' does not exist");
+    }
+}
\ No newline at end of file

lib/Doctrine/ORM/Tools/ToolsException.php

+<?php
+
+namespace Doctrine\ORM\Tools;
+
+class ToolsException extends ORMException {
+    public static function couldNotMapDoctrine1Type($type) {
+        return new self("Could not map doctrine 1 type '$type'!");
+    }
+}
\ No newline at end of file