Update djangoproject/templates/core/base.html

In preparation for fixing issue #95, i've added 2 ids for base-top and base-main so the CSS affects the right areas more reliably.
Merge pull request #124 from jarlarntzen/patch-3

Update djangoproject/templates/core/base.html
Merge pull request #122 from henriquebastos/settings

New settings strategy
Update django-aggregate-if version.
Add feedback issues that should not be listed to the scenario
Fix IssueManager to ignore feedback issues.

Regardless of the current Issue model complexity,
here I'm just following `issue_service.search`
behavior.

We still need to improve the Issue model.
Merge branches 'master', 'home' and 'stats' into develop