Added rename function

Wanted to move a file, but didn't want to use os.

salt/modules/file.py

@@ -925,6 +925,22 @@ def symlink(src, link):
         raise CommandExecutionError('Could not create "{0}"'.format(link))
     return False
 
+def rename(src, dst):
+    '''  
+    Rename a file or directory
+    CLI Example
+        salt '*' file.rename /path/to/src /path/to/dst
+    '''
+    if not os.path.isabs(src):
+        raise SaltInvocationError('File path must be absolute.')
+
+    try: 
+        os.rename(src, dst) 
+        return True 
+    except OSError:
+        raise CommandExecutionError('Could not rename "{0}" to "{1}"'.format(src, dst))
+    return False
+
 def stats(path, hash_type='md5', follow_symlink=False):
     '''
     Return a dict containing the stats for a given file