Added support for PHP native sort

Author: Larry Lewis

README.md

@@ -18,3 +18,22 @@ or to check if a constraint is a subset of another constraint.
 All that is done to let us select which version is compatible with a user constraints.
 
 It works with the same rules of Composer versioning.
+
+### Sorting
+In order to use standard PHP sorting there is a helper class 'Compare' to use it with a sort you will need to do this;
+
+```php
+use Version\Version;
+use Version\Compare;
+
+$vers = array();
+$vers[] = Version::parse('1.1.1d1');
+$vers[] = '1.1.1';
+
+$obj = new Compare();
+usort( $vers, array( $obj, 'compare' ) );
+```
+
+The above should allow any normal PHP sort to be instigated with very little effort.
+
+**Note**: You should see that it will handle a string or a Version object as the variable to sort automatically.

src/Version/Compare.php

@@ -0,0 +1,14 @@
+<?php
+namespace Version;
+
+use Version\Version;
+
+class Compare
+{
+    public function compare( $v1, $v2 )
+    {
+        $va1 = ( $v1 instanceof Version ) ? $v1 : Version::parse( $v1 );
+        $va2 = ( $v2 instanceof Version ) ? $v2 : Version::parse( $v2 );
+        return( $va1->compare( $va2 ) );
+    }
+}