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Table Mixins
============
It's possible to create a mixin for a table that overrides something, however
unless it itself is a subclass of `.Table` class variable instances of
`.Column` will **not** be added to the class which is using the mixin.
Example::
>>> class UselessMixin:
... extra = tables.Column()
...
>>> class TestTable(UselessMixin, tables.Table):
... name = tables.Column()
...
>>> TestTable.base_columns.keys()
["name"]
To have a mixin contribute a column, it needs to be a subclass of
`~django_tables2.tables.Table`. With this in mind the previous example
*should* have been written as follows::
>>> class UsefulMixin(tables.Table):
... extra = tables.Column()
...
>>> class TestTable(UsefulMixin, tables.Table):
... name = tables.Column()
...
>>> TestTable.base_columns.keys()
["extra", "name"]
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