url_in and url_is renamed to url_dir and url_file

Change-Id: Ida034859d06cc649d6658ef14ebfecc80586b439
diff --git a/rsync_url.py b/rsync_url.py
index f69e93a..619dbbb 100644
--- a/rsync_url.py
+++ b/rsync_url.py
@@ -193,7 +193,7 @@
             result += '/'
         return result
 
-    def url_in(self, *path):
+    def url_dir(self, *path):
         return self.a_dir(self.url, *path)
 
     def a_file(self, *path):
@@ -203,5 +203,5 @@
                 result = result[:-1]
         return result
 
-    def url_is(self, *path):
+    def url_file(self, *path):
         return self.a_file(self.url, *path)