remove steam.client.mixins as it was never used

docs/api/steam.client.mixins.rst

@@ -1,6 +0,0 @@
-mixins
-======
-
-.. automodule:: steam.client.mixins
-
-

docs/api/steam.client.rst

@@ -10,7 +10,6 @@ client
 
 .. toctree::
     steam.client.builtins
-    steam.client.mixins
     steam.client.gc
     steam.client.user
 

steam/client/mixins/__init__.py

@@ -1,53 +0,0 @@
-"""
-All optional features are available as mixins for :class:`steam.client.SteamClient`.
-Using this approach the client can remain light yet flexible.
-Functionality can be added through inheritance depending on the use case.
-
-
-Here is quick example of how to use one of the available mixins.
-
-.. code:: python
-
-    from steam import SteamClient
-    from stema.client.mixins.somemixing import SomeMixing
-
-    class CustomSteamClient(SteamClient, SomeMixing):
-        pass
-
-    client = CustomSteamClient()
-
-
-Making custom mixing is just as simple.
-
-.. warning::
-    Take care not to override existing methods or properties, otherwise bad things will happen
-
-.. note::
-    To avoid name collisions of non-public variables and methods, use `Private Variables <https://docs.python.org/2/tutorial/classes.html#private-variables-and-class-local-references>`_
-
-
-.. code:: python
-
-    class MyMixin(object):
-        def __init__(self, *args, **kwargs):
-            super(MyMixin, self).__init__(*args, **kwargs)
-
-            self.my_property = 42
-
-        def my_method(self)
-            print "Hello!"
-
-
-    class MySteamClient(SteamClient, MyMixin):
-        pass
-
-    client = MySteamClient()
-
-.. code:: python
-
-    >>> client.my_property
-    42
-    >>> client.my_method()
-    Hello!
-
-"""