Update the bidindings

Make repository parametrized

README.md

@@ -21,22 +21,10 @@ in it.
     $ cd geef
     $ make
 
-Now you should have a .beam file you can load.  I've also included an example
-escript to test some of the functions (currently just hex_to_raw and object_exists):
-
-    $ ./geef h2r de08fe4884650f067bd5703b8a59a8b3b3c99aaa
-    Raw: <<222,8,254,72,132,101,15,6,123,213,112,59,138,89,168,179,179,201,154,170>>
-
-    $ ./geef exists . 89c86150c8b164f441a73f4991b2c339fd4aae7c
-    Exists: true
-
-    $ ./geef exists . 87fcfb277899097823911006f438658ce86b3697
-    Exists: false
-
 The API looks basically like this:
 
-    Raw = geef:hex_to_raw(HexSha).
-    Repo = geef:repository(".").
+    Repo = geef:repository(<<".">>).
+    Workdir = Repo:workdir().
     Odb = geef:repository_odb(Repo).
     Exists = geef:odb_exists(Odb, HexSha).