Merge branch 'bugfix/make-compatible' into 'master'

major bugfix for translable/translatable

See merge request !9

src/Translable.php

+<?php
+
+/**
+ * @deprecated Have typo so better use WPDesk_Translatable
+ */
+interface WPDesk_Translable  {
+	/** @return string */
+	public function get_text_domain();
+}
\ No newline at end of file

src/Translatable.php

 <?php
 
+if ( ! interface_exists( 'WPDesk_Translable' ) ) {
+    require_once 'Translable.php';
+}
+
 /**
  * Have info about textdomain - how to translate texts
  *
  * have to be compatible with PHP 5.2.x
  */
-interface WPDesk_Translatable  {
+interface WPDesk_Translatable extends WPDesk_Translable {
 	/** @return string */
 	public function get_text_domain();
 }
\ No newline at end of file