Use DEBUG instead of TEMPLATE_DEBUG to turn on/off minified JS
Fixes #826

TEMPLATE_DEBUG was always being set to True, since it was set to the value
of DEBUG *before* DEBUG was reset from local_settings.py.

Instead, we are now always setting TEMPLATE_DEBUG to True, since it has no
effect when DEBUG is False
Merge pull request #828 from maurizi/fix/826/minifedJs

Use DEBUG instead of TEMPLATE_DEBUG to turn on/off minified JS