Tri-table

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* Fix missing copy of `attrs__class`

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* `Column` class now inherits from `object`, making the implementation more pythonic.
(Attributes still possible to override in constructor call, see `NamespaceAwareObject`)

* `*.template` overrides can now be specified as `django.template.Template` instances.

* The `template_name` parameter to `render_table` is now deprecated and superceeded by a `template` parameter.

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* Updated to newest tri.form, tri.query, tri.declarative. This gives us simpler factories for `from_model` methods.

* Added shortcuts to `Column`: `time` and `decimal`

* The following shortcuts have been updated to use the corresponding `Variable` shortcuts: date, datetime and email

* Fix failure in endpoint result return on empty payload.
`[]` is a valid endpoint dispatch result.

* `render_table`/`render_table_to_response` no longer allow table to be passed as a positional argument

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* Fix crash on unidentified sort parameter.

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* `bound_row` is passed to row level callables. This is a potential breaking
change if you didn't do `**_` at the end of your function signatures (which you
should!)

* `bound_row` and `bound_column` is passed to cell level callables. This is a
potential breaking change like above.

* `BoundRow` now supports `extra`.

* compatibible with Django 1.9 & 1.10

* Added strict check on the kwargs config namespace of `Table`

* Added `extra` namespace to `Table`

* Added `bound_cell` parameter to rendering of cell templates.

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* Added optional `endpoint_dispatch_prefix` table configuration to enable multiple
tables on the same endpoint.