Django-fastdev

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* Fixed: include template tags in source distribution

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* Fix for bug in gitignore validation

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* New template tag: '{% ifexists foo %}{% elifexists bar %}{% else %}{% endifexists %}` to use instead of `{% if %}` to check if a variable exists in the context.

* Warn if you use `{% if %}` to check for existance of a variable (really warn if it triggers false if the lookup fails)

* New setting: `FASTDEV_STRICT_IF`. Set this to `True` to make `{% if %}` crash on non-existant variables. This setting will very likely break some of the Django admin, because it relies on this behavior!


* Check that the venv and pycache stuff is in .gitignore

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* Non-existant variable accessed inside an `{% if %}` didn't crash.

* Warning on invalid fk field name. So for example using `car_id = ForeignKey(Car)` will now warn and explain what you should do.

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* .gitignore validation

* Removed accidental debug print left in the code.

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* Removed invalid block check. It didn't work properly.