redink/ej — pull request #1 by redink (2013-10-13 04:11:10+00:00)
Title: update type define from seth 

it is very nice for type define

```
-type ej_array_select() :: {select, all | {json_string(),
json_string() |
json_number() |
json_boolean() |
json_null()}}.

-type key_type() :: binary() | integer() | first | last | new |
ej_array_select().

-type key_tuple() :: tuple().
-type key_list() :: [key_type()].
-type ej_key_path() :: key_tuple() | key_list().
```