Improvement on Top Downloaded Apps

[yihangx]

Now, top downloaded apps show all-time top downloaded apps, which is kind of outdated. It should show top downloaded apps in last 24 months.

Related code:

appstore/apps/views.py

Line 90 in dce25f1

downloaded_apps = App.objects.filter(active=True).order_by('downloads').reverse()[:_DefaultConfig.num_of_top_apps]

appstore/apps/views.py

Line 118 in dce25f1

def all_apps_downloads(request):